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Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science Chapter 10 Light Reflection and Refraction .

Question 1:

Read the following and answer any four questions from (i) to (v).

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on screen, the image is real and when the image does not form on screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual.

A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole. the image formed is virtual and erect.

A convex mirror always forms a virtual, erect and diminished image. A concave mirror is used as doctor’s head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object.

(i) When an object is placed at the centre of curvature of a concave mirror, the image formed is (a) larger than the object (b) smaller than the object (c) same size as that of the object (d) highly enlarged.

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be (a) plane (b) concave (c) convex (d) either plane or convex.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top. (a) Plane, convex and concave (b) Convex, concave and plane (c) Concave, plane and convex (d) Convex, plane and concave

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror.

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen. (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Question 2:

The lenses forms different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect and diminished image irrespective to the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

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Case Study Questions Class...

Case Study Questions Class 10 Science

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Download the app to get CBSE Sample Papers 2023-24, NCERT Solutions (Revised), Most Important Questions, Previous Year Question Bank, Mock Tests, and Detailed Notes.

Download Case study questions for CBSE class 10 Science in PDF format from the myCBSEguide App . We have the new pattern case study-based questions for free download. Class 10 Science case study questions

This article will guide you through:

What are case study questions?

Sample Papers with Case Study questions
Class 10 Science Case Study question examples
How to get case-based questions for free?
How to attempt the case-based questions in Science?

Questions based on case studies are some real-life examples. The questions are asked based on a given paragraph i.e. Case Study. Usually, 4-5 questions are asked on the basis of the given passage. In most cases, these are either MCQs or assertion & reason type questions. Let’s take an example to understand. There is one paragraph on how nitrogen is generated in the atmosphere. On the basis of this paragraph, the board asks a few objective-type questions. In other words, it is very similar to the unseen passages given in language papers. But the real cases may be different. So, read this article till the end to understand it thoroughly.

What is CBE?

CBSE stands for competency-based education. The case study questions are part of this CBE. The purpose of CBE is to demonstrate the learning outcomes and attain proficiency in particular competencies.

Questions on Real-life Situations

As discussed the case study questions are based on real-life situations. Especially for grade 10 science, it is very essential to have the practical knowledge to solve such questions. Here on the myCBSEguide app, we have given many such case study paragraphs that are directly related to real-life implications of the knowledge.

Sample Papers with Case Study Questions

Class 10 Science Sample Papers with case study questions are available in the myCBSEguide App . There are 4 such questions (Q.No.17 to 20) in the CBSE model question paper. If you analyze the format, you will find that the MCQs are very easy to answer. So, we suggest you, read the given paragraph carefully and then start answering the questions. In some cases, you will find that the question is not asked directly from the passage but is based on the concept that is discussed there. That’s why it is very much important to understand the background of the case study paragraph.

CBSE Case Study Sample Papers

You can download CBSE case study sample papers from the myCBSEguide App or Student Dashboard. Here is the direct link to access it.

Case Study Question Bank

As we mentioned that case study questions are coming in your exams for the last few years. You can get them in all previous year question papers issued by CBSE for class 1o Science. Here is the direct link to get them too.

Class 10 Science Case Study Question Examples

As you have already gone through the four questions provided in the CBSE model question paper , we are proving you with other examples of the case-based questions in the CBSE class 10 Science. If you wish to get similar questions, you can download the myCBSEguide App and access the Sample question papers with case study-type questions.

Case-based Question -1

Read the following and answer any four questions: Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloride and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt bed of rack salt was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

Phosphoric acid
Carbonic acid
Hydrochloric acid
Sulphuric acid
Blue vitriol
Washing soda
Baking soda
Bleaching powder

Case-based Question -2

V 1 + V 2 + V 3
V 1 – V 2 +V 2
None of these
same at every point of the circuit
different at every point of the circuit
can not be determined
20 3 Ω 203Ω
15 2 Ω 152Ω

Case-based Question -3

pure strips
impure copper
refined copper
none of these
insoluble impurities
soluble impurities
impure metal
bottom of cathode
bottom of anode

How to Attempt the Case-Based Questions in Science?

Before answering this question, let’s read the text given in question number 17 of the CBSE Model Question Paper.

All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

See, there are only two sentences and CBSE is asking you 5 questions based on these two sentences. Now let’s check the first questions given there.

Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food

Now let us know if you can relate the question to the paragraph directly. The two sentences are about energy and how it is obtained. But neither the question nor the options have any similar text in the paragraph.

So the conclusion is, in most cases, you will not get direct answers from the passage. You will get only an idea about the concept. If you know it, you can answer it but reading the paragraph even 100 times is not going to help you.

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CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

CBSE Class 10 Science Chapter-10 Important Questions with Answers - Free PDF Download

The concept of light, reflection, and refraction is quite fascinating for the students of Class 10. In the previous classes, students have learned a lot of new things related to these two natural phenomena occurring with light. In Class 10, they will advance to a new level of concepts related to reflection and refraction. The textbook explains the concepts pretty well. Students will need more Light Reflection and Refraction Class 10 Important Questions with answers to prepare for the exams.

By studying the Class 10 Science Chapter 10 Important Questions, you will develop your concept for this chapter in a better way. In fact, your answering skills will also increase considerably. Check out how the expert teachers at Vedantu have answered the Light Class 10 Important Questions niftily. Download the PDF and follow the format of answering questions as shown by the experts to score more. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Download CBSE Class 10 Science Important Questions 2024-25 PDF

Also, check CBSE Class 10 Science Important Questions for other chapters:

Related Chapters

Important Topics under CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction

The following list of important topics covered under the chapter on Light Reflection and Refraction has been provided for students so that they can take a glance at the major concepts and read them through before diving into the important questions.

Reflection of Light

Spherical Mirrors

Image Formation by Spherical Mirrors

Sign Convention for Spherical Mirrors

Mirror Formula and Magnification

Refraction of Light

Refraction through a Rectangular Glass Slab

Refractive Index

Refraction by Spherical Lenses

Image Formation by Lenses and Their Ray Diagrams

Sign Convention for Spherical Lenses

Lens Formula and Magnification

Power of a Lens

Study Important Questions for Class 10 Science Chapter 10 - Light Reflection and Refraction

Long Answer Questions (5 Marks)

1. A convex lens has a focal length of \[10\] cm. At what distance from the lens should the object be placed so that it forms a real and inverted image $20$ cm. away from the lens? What would be the size of the image formed if the object is $2$ cm high? With the help of a ray, the diagram shows the formation of the image by the lens in this case?

Ans: Given, the focal length of the convex lens,

$\Rightarrow f=+10$ cm

Also, given the image formed is real and inverted with the image distance as $20$ cm.

$\Rightarrow v=+20$ cm

From the lens formula, we have:

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{20}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=\dfrac{1}{20}-\dfrac{1}{10}$

$\Rightarrow \dfrac{1}{u}=\dfrac{-1}{20}$

$\Rightarrow u=-20$ cm.

$\therefore $ The object is placed at a distance of $20$ cm.

Magnification is given as,

$\Rightarrow m=-\dfrac{v}{u}$

$\Rightarrow m=-\dfrac{20}{\left( -20 \right)}$

$\Rightarrow m=+1$

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$.

$\therefore m=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow 1=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow Height\text{ of the image}=2$ cm.

Thus, the image is of the same size as that of the object and it is real and inverted.

The ray diagram representing the formation of the image by the lens in this case is:

It is observed that the image is formed at $2{F_2}$ with the object placed at $2{F_1}$.

2. Draw a ray diagram to show the use of a convex lens for the formation of images having the following characteristics.

a. Real & inverted and diminished

Ans: A ray diagram representing a real & inverted and diminished image is given below.

b. Virtual, erect & magnified.

Ans: A ray diagram representing a virtual, erect, and magnified image is given below.

3. A convex lens forms a real and inverted image of a needle at a distance of $50$ cm. from it. Where is the needle placed in front of the convex lens if the image is equal to the size of objects? Also, find the power of the lens.

Ans: Given, the image is real and inverted at a distance of $50$ cm.

$\Rightarrow v=+50$ cm

Also given, Height of image $=$ Height of object

We know, magnification is given as,

$\therefore -\dfrac{v}{u}=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$

Since, Height of image $=$ Height of object and $v=+50$ cm

$\Rightarrow -\dfrac{50}{u}=1$

$\Rightarrow u=-50$ cm

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{50}-\dfrac{1}{-50}$

$\Rightarrow f=25$ cm

$\Rightarrow f=0.25$ m

The power of a lens is given by,

$\Rightarrow P=\dfrac{1}{f}$

$\Rightarrow P=\dfrac{1}{0.25}$ m

$\Rightarrow P=+4$ D

4. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answers experimentally. Explain your observations.

Ans: If we cover one-half of a convex lens with black paper it is observed that it produces a complete image of the object.

Representing the given situation with a ray diagram.

One-half of a convex lens is covered with black paper

Adjust the position of the burning candle such that its image is formed on the screen placed on the other side of the lens.

We get a full image of the burning candle on the screen.

Thus, from the above observation, we conclude that the formation of an image does not depend on the length of the lens, but the brightness of the image formed on the screen depends since the number of rays passing through the lens gets reduced on covering half the lens with black paper.

5. An object $5$ cm in length is held $25$ cm away from a converging lens of focal length $10$ cm. Draw the ray diagram and find the position, size, and nature of the image formed.

Ans: Given focal length of the lens, $f=+10$ cm.

Object distance from the converging lens is given to be $25$ cm and the height of the object ($ho$) is given to be $5$ cm.

$\Rightarrow u=-25$ cm

$\Rightarrow ho=5$ cm

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{v}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{v}=\dfrac{1}{25}-\dfrac{1}{10}$

$\Rightarrow v=\dfrac{50}{3}$ cm

$\Rightarrow v=16.7$ cm

Thus, we conclude that the image formed is real and inverted and is formed at a distance of $16.7$ cm on the other side of the lens.

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}=\dfrac{hi}{ho}$.

$\therefore -\dfrac{v}{u}=\dfrac{hi}{ho}$

$\Rightarrow \dfrac{16.7}{-25}=\dfrac{hi}{5}$

$\Rightarrow hi=-\dfrac{10}{3}$ cm

Hence, the image is diminished.

The ray diagram representing the above situation is drawn below.

the image formed is real and inverted and is formed at a distance

6. A convex lens of focal length $15$ cm formed an image $10$ cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Ans: Given focal length of the lens, $f=15$ cm.

Image distance from the converging lens is given to be $10$ cm.

$\Rightarrow v=-10$ cm

We observe that the image distance is less than the focal length, hence the image formed would be virtual and erect.

$\Rightarrow \dfrac{1}{15}=\dfrac{1}{-10}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=-\dfrac{1}{10}-\dfrac{1}{15}$

$\Rightarrow u=-6$ cm

The image distance is less than the focal length, hence the image formed would be virtual and erect.

Light: Reflection and Refraction - Important Questions and Solutions Summary

light rays, mirrors, lenses, prisms, etc., is the advanced version of what you As mentioned earlier, the chapter related to light, reflection, and refraction of have studied in the previous classes. In Class 10, you will have to focus on the theoretical part, as well as, the use of these theories to answer questions.

After you have completed answering the basic questions in the exercise, you might need a question bank to learn more about this chapter. This is where Light Reflection and Refraction Class 10 Important Questions with Answers can be used perfectly. These questions will intellectually challenge your knowledge and foundation of concepts based on this topic. You can answer on your own and check whether you know the right answer or not.

Class 10 Light Reflection and Refraction Important Questions have been developed by the expert teachers to provide a strong idea of how questions are set in the exams. All these questions are developed to define how theoretical concepts are used to solve conceptual problems. You will gain a better insight into the chapters and strengthen your foundation accordingly.

Benefits of Studying the CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction

The Important Questions for Class 10 Light Reflection and Refraction have been developed based on the basic and advanced concepts you have learned in your science textbook. Let us check the benefits of studying these questions first.

Thinking Out of the Box

The Important Questions of Light Reflection and Refraction Class 10 is the ultimate suggestion for the upcoming board exam. You can study these questions, prepare their answers on your own, and compare them with the solution provided. This will help you to understand how efficiently you have studied the chapter. Light Class 10 Important Questions have been developed to help you think out of the box. In most cases, the thoughts of the students remain stuck in the exercises of the textbook. These questions will help them think out of the box and challenge their intellect.

Getting to Know Possible Important Questions of Chapter 10 Class 10 Science

By studying Class 10th Science Chapter 10 Important Questions , you will get to know possible questions that might come in the board exams. All these questions are developed by experienced science teachers. They are well-aware of the type of questions asked in the CBSE exam . Hence, studying these questions will help you learn about different modes and patterns.

Making Concepts Easier to Understand

The Important Questions for Class 10 Science Light Reflection and Refraction have simple explanations. All the concepts in this chapter will be exceptionally simplified and utilized to answer these important questions. Hence, the students will get another way to learn how to use the textbook concepts to solve challenging questions in the exams.

Efficient Answering Methods

The Ch 10 Science Class 10 Important Questions will also come with a proper solution. The solutions will have the perfect answers to all these important questions. You will get another set of questions and answers to follow and find out the best approaches to score well in the exams. These approaches are simplified and designed by following the CBSE guidelines .

Mastering Solving Numerical Questions

This chapter poses a challenge in the form of numerical questions related to mirrors and lenses. These problems are based on a set of formulas related to the focal distance, object distance, and image distance of lenses and mirrors. By using Class 10 Science Chapter 10 Important Questions and Solutions, you can master using the formula in different aspects without committing mistakes.

You can download Chapter 10 Science Class 10 Important Questions and solutions in PDF format and study them offline. Get this extra set of questions and use them as a reference to clear your concepts of this crucial chapter.

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FAQs on CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

1. Why Should You Prefer Vedantu for Important Questions of Light Class 10?

The teachers of Vedantu have formulated the best possible questions of Class 10 Light for the students to follow. The answers are simple and follow the CBSE guidelines. You can rest be assured that you will get the best-quality questions and answers to study.

2. Why Should You Study Light Reflection and Refraction Important Questions?

By studying the Light Reflection and Refraction Class 10 Important Questions, you will get a good idea of what questions are asked in the board exam. Follow the answering style and score more in the main exam.

3. What are the important topics covered in the CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction?

The following are the important topics covered in the Chapter on Light Reflection and Refraction:

CBSE Class 10 Science Important Questions

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CBSE Class 10 Science Case Based MCQ Questions

CBSE Term 1 exam is not so far and surely you have begun the preparation for the board exam. Therefore we have dedicated this page to help you out in your preparation. This year for the first time the board has introduced the Case based Questions which will be asked in the Term 1 exam that is likely to be held in November-December.

Therefore, we have brought you the CBSE Class 10 Science Case Based MCQ on this page. The questions are given in objective types. Such types of questions are solved by reading the given scenario in the paragraph.

All these science case study questions are developed as per the new CBSE Pattern. The team of subject matter experts have crafted the given MCQs. The Case Based Questions that we are providing here are worthy to solve and practice because class 10th syllabus has been taken into consideration while preparing the problems.

CBSE Class 10 Science Case Study, Assertion & Reasoning, MCQ

The Class tenth CBSE Science Case Study, Assertion & Reasoning, MCQs are very helpful in practicing and getting a deep understanding in the topics of science. However, a comprehensible knowledge of NCERT Science Book is a must to be able to solve these types of problems.

The PDF that is available here to download contains the problems in three different variants; One is general objective types of questions that is MCQ (Multiple Choice Questions), second one is Assertion and Reasoning and the last one is Case-Based Questions.

If you Download PDF CBSE Class 10 Science Case Study from the given links, then you will be able to get the quick revision for each chapter that will help you to recall your learnings and give you information about some important Chemicals Formulas and reactions.

What are Assertion & Reasoning Questions?

Assertion & Reasoning questions are basically a type of multiple-choice question that is solved by reading the given statement and the reason. The question typically consists of one statement followed by its reason. Students' duty is to verify both statements and reason whether they are correct or not and if they are correct then it is time to look at whether the given statement truly satisfies the reason or not.

These questions should not be difficult to solve but you have to have rigorous and extensive practice. The Assertion & Reasoning questions along with the solutions are given in the CBSE Class 10 Science case study 2021-2022 PDF that is available here.

Class 10th has very basic and important chapters that are necessary to solve. A few chapters that are available in the beginning of the science books are Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals, Carbon and Its Compounds, Periodic Classification of Elements, Life Processes, etc.

Since you are here to find out the CBSE Class 10 Science MCQ Based Questions, the possibilities are you need CBSE Class 10 Maths Case Study Questions too.

FAQs on CBSE Class 10th Science Case Study Questions

Case Study Questions are based on the data which are given in the form of passage. These types of questions generally consist of real life examples. Usually it contains upto 4 or 5 questions.

To prepare for Class 10 Science MCQ Be thorough with the concepts, Practice the questions regularly, Attempt online tests as much as you can. To do all these things visit the Selfstudys.com. They are providing everything for free of cost.

In class 10 Science Based Questions you will be asked to answer the questions that are explained in the standard Xth Science Syllabus. However, the problems will be related to real world examples.

To find Class 10 Science Chapter wise Assertion and Reason Questions you simply need to reach at the Selfstudys website. It provides all the study resources for free of cost. You will be able to download the assertion reason with solutions as well.

No, CBSE Class 10 Science Case Based MCQ Question is not difficult, if you pay a good attention to the given paragraph. It is important to be able to find the tiny details in the passage to answer the Case Based questions.

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CBSE Class 10 Science Case Study Questions Download Free PDF

If you are looking for the CBSE Class 10 Science Case Study Questions in PDF, then you are in the right place. CBSE 10th Class Case Study for the Science Subject is available here. These Case studies can help the students to solve the different types of questions that are based on the case study.

CBSE Board will be asking case study questions based on Science subjects in the upcoming board exams. Thus, it becomes an essential resource to study.

The Science Subject case study for class 10th covers a wide range of chapters from the Science. Students willing to score good marks in their board exams can use it. The questions are highly interactive and it allows students to use their thoughts and skills to solve such kinds of questions.

Case Study Questions Class 10 Science

In board exams, students will find the questions based on assertion and reasoning . Also, there will be a few questions based on case studies. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Case Study Questions for Chapter 1 Chemical Reactions and Equations
Case Study Questions for Chapter 2 Acids, Bases, and Salts
Case Study Questions for Chapter 3 Metals and Non-Metals
Case Study Questions for Chapter 4 Carbon and Its Compounds
Case Study Questions for Chapter 5 Periodic Classification of elements
Case Study Questions for Chapter 6 Life Processes
Case Study Questions for Chapter 7 Control and Coordination
Case Study Questions for Chapter 8 How do organisms reproduce?
Case Study Questions for Chapter 9 Heredity and Evolution
Case Study Questions for Chapter 10 Light reflection and refraction
Case Study Questions for Chapter 11 Human eye and colorful world
Case Study Questions for Chapter 12 Electricity
Case Study Questions for Chapter 13 Magnetic effects of current
Case Study Questions for Chapter 15 Our Environment

The above Case studies for CBSE Class 10 Science will help you to score good marks in the Case Study questions that have been coming in your examinations. These CBSE Class 10 Science Case Study have been developed by experts of cbseexperts.com for benefit of Class 10 students.

Class 10 Science Assertion and Reason Questions

Case Study Type Questions in Science Class 10

Case Study Type Questions in Science Class 10 include the information or data. Students willing to solve them are required to read the passage carefully and then solve them. While solving the paragraph the ideal way is to highlight the key information or given data.

Because later it will ease them to write the final answers. Science Case study type questions consist of 4 to 5 questions that should be answered in an MCQ manner.

While reading the paragraph students will get the clue in between about the possible answer of the question. They should definitely highlight those questions. This is the best way to solve such kind of Case study Type Questions.

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CBSE Class 10 Science Case Study Questions for Term 2 Exam 2022 (with Answers): Best for Last Minute Revision

Check case study questions curated by experts for cbse class 10 science to prepare for the term 2 exam 2022. download chapter-wise questions in pdf and practice to score high marks in the exam..

Check some of the important case study questions below:

Q. Read the following carefully and answer the questions .

In covalent compounds atoms share valence electrons to satisfy the octet. Each atom shares one pair or two pairs or three pairs of electrons depending on their combining capacity. In electron dot structures only number of valence electrons are shown around the symbols of constituent atoms. Carbon using its valency of four can make either single, double or triple bonds with other carbon atoms or any other atoms. Carbons self-linking property is called catenation. In hydrocarbons carbon makes aliphatic or cyclic molecules they are either saturated or unsaturated. Based on these facts Read the following paragraph and answer the questions given below.

An element X combines with Y to form a colourless odourless gas, Z which turns lime water milky is the major constituent of all organic molecules. Five X atoms combines with hydrogens to form a cyclic saturated hydrocarbon J and aliphatic unsaturated hydrocarbon Q. Q is used in gas welding.

(1) Identify compound Z and draw its electron dot structure.

(2) Write the chemical formula and IUPAC name of compound Q

(3) What is the common name of Q

(4) How many single covalent bonds are present in compound J?

1) Z is CO 2 its electron dot structure is

2) C 2 H 2 , ethyne

3) Acetylene

Q. Read the following carefully and answer the questions.

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral.

Based on the above information answer the following questions:

(1) To which group or period of the Periodic Table do the listed elements belong?

(2) What would be the nature of compound formed by a combination of elements B and F?

(3) Which two of these elements could definitely be metals?

(4) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

1. A and B belong to group 1 and 2 because they form basic oxides.

C belongs to group 13 as it has 3 valence electrons.

D belongs to group 14 as it forms almost neutral oxide.

E and F belong to group 15 and 16 as they form acidic oxides,

G belongs to group 17 as it has 7 valence electrons and

H belongs to group 18.

They belong to 3rd period of the Periodic Table because AG is NaCl, added in a small amount to almost all vegetable dishes during cooking and Na and Cl belong to 3rd period.

2. Ionic compounds will be formed because ‘B’ is metal and ‘F’ is non-metal. ‘B’ can lose two electrons and ‘F’ can gain two electrons.

3. A and B are definitely metals as they form basic oxides.

4. CG3 is the formula of the compound formed by combination of C and G.

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CBSE 10th Standard Science Subject Heredity and Evolution Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Cbse 10th standard science subject heredity and evolution case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

Sex determination is the method by which distinction between males and females is established in a species. The sex of an individual is determined by specific chromosomes. These chromosomes are called sex chromosomes or allosomes. X and Y chromosomes are called sex chromosomes. The normal chromosomes other than the sex chromosomes of an individual are known as autosomes. (i) In XX-XO type of sex determination (a) females produce two different types of gametes (b) males produce two different types of gametes (c) females produce gametes with Y chromosome (d) males produce gametes with Y chromosome. (ii) A couple has six daughters. What is the possibility of their having a girl next time?

(iii) Number of autosomes present in liver cells of a human female is

(iv) XX-XO type of sex determination and XX-XY type of sex determination are the examples of

(v) Select the incorrect statement. (a) In male grasshoppers, 50% of sperms have no sex chromosome (b) Female fruitfly is heterogametic (c) Human male produces two types of sperms 50% having X chromosome and 50% having Y chromosomes (d) In turtle, sex determination is regulated by environmental factors.

Gregor Mendel conducted hybridisation experiments on garden peas for seven years and proposed the laws of inheritance in living organisms. He investigated characters in the garden pea plant that were manifested as two opposing traits, e.g., tall or dwarf plants, yellow and green seeds, etc. (i) Among the seven pairs of contrasting traits in pea plant as studied by Mendel, the number of traits related to flower, pod and seed respectively were

(ii) The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

(iii) Refer to the given table of contrasting traits in pea plants studied by Mendel.

Which of the given traits is correctly placed? (a) (i), (ii) and (iii) only (b) (ii), (iii) and (iv) only (c) (ii) and (iii) only (d) (i), (ii), (iii) and (iv) (iv) Some of the dominant traits studied by Mendel were (a) round seed shape, green seed colour and axial flower position (b) terminal flower position, green pod colour and inflated pod shape (c) violet flower colour, green pod colour and round seed shape (d) wrinkled seed shape, yellow pod colour and axial flower position. (v) Which of the following characters was not chosen by Mendel?

Mendel crossed tall and dwarf pea plants to study the inheritance of one gene. He collected the seeds produced as a result of this cross and grew them to generate plants of the first hybrid generation which is called the first filial progeny or F 1 : Mendel then self pollinated the tall F 1 plants and he obtained F 2 generation. (i) In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedlings would have non-parental phenotype?

(ii) If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ? (a) All will exhibit dominant phenotype. (b) All will exhibit recessive phenotype. (c) Dominant and recessive phenotypes will be 50% each. (d) Dominant phenotype will be 75%. (iii) Which of the following crosses will give tall and dwarf pea plants in same proportions?

(iv) What result Mendel would have got, if he self pollinated a homozygous tall F 2 plant? (a) TT and Tt (b) All Tt (c) All TT (d) All tt (v) In plant, tall phenotype is dominant over dwarf phenotype, and the alleles are designated as T and t, respectively. Upon crossing one tall and one dwarf plant, total 250 plants were obtained, out of which 124 displayed tall phenotype and rest were dwarf. Thus, the genotype of the parent plants were (a) TT x TT (b) TT x tt (c) Tt x Tt d) Tt x tt.

The cross that include the inheritance of two pairs of contrasting characters simultaneously is referred as dihybrid cross. Mendel chose pure breeding plants for yellow and green seeds and round and wrinkled shape of seeds. He cross pollinated the plant having yellow round seeds with plant having green wrinkled seeds. All the plants produced in F 1 generation were having, yellow round seeds. The plants raised from these seeds were self pollinated, that resulted in production of plants having four phenotypically different types of seeds. (i) When a cross is made between a yellow round seeded plant (YyRr) and a yellow wrinkled seeded plant (Yyrr), what is true regarding the proportions of phenotypes of the offsprings in F 1 generation?

(ii) How many types of gametes can be produced by YYrr?

(iii) In Mendelian dihybrid cross, when heterozygous tall plant with green seeds are self crossed the progenies are

(iv) When round yellow seeded heterozygous pea plants are self fertilised, the frequency of occurrence of RrYY genotype among the offsprings is

(v) The percentage of yr gamete produced by YyRr parent will be

In human, the allele for brown eyes (B) is dominant over that for blue eyes (b). A brown eyed woman marries a blue eyed man, and they have six children. Four of the children are brown eyed and two of them are blue eyed. (i) What is the genotype of blue eyed offspring?

(ii) What is the woman's genotype?

(iii) The ovum, produced by the mother carries the gene regarding eye colour is

(iv) The ratio of brown eyed children to blue eyed children in this family is 2 : 1, which deviates from typical phenotypic ratios for monohybrid inheritance. What might be the reason? (a) Gametes carrying the brown eyed allele are more viable then those with the blue eyed allele. (b) A different pattern of inheritance other than monohybrid inheritance is involved. (c) Not all of their babies survived childbirth, thus causing a distortion in the actual ratio. (d) The actual ratio differs from the expected ratio because the sample size is too small. (v) What is the gene carried by of the man's sperm regarding the eye colour?

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Cbse 10th standard science subject heredity and evolution case study questions with solution 2021 answer keys.

(i) (b) : In XX-XO type and XX-XY type of sex determining mechanisms, males produce two different types of gametes, either with or without X-chromosome (XO type), or some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype. (ii) (b): The possibility of having a girl or boy child is equal i.e., 50%, as 50% male gametes are Y type and 50% are X type. Fusion of egg with X type sperm will produce a girl child. (iii) (b): In humans, number of autosomes are 2n = 44 or 22 pairs regardless of the sex. (iv) (a): In XX-XO type and XX-XY type of sex determining mechanisms, males produce two different types of gametes, either with or without X-chromosome (XO type), or some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype. (v) (b): Male fruitfly is heterogametic whereas female fruitfly is homogametic.

(i) (a) : Characters studied by Mendel are as follows:

Phenotypic ratio is:

(i) (c) (ii) (b) : According to the given passage some children show recessive trait, i.e., homozygous. So, the woman must be heterozygous. (iii) (c): Human ova are haploid, hence they only contain one copy of each gene. Since the woman has a Bb genotype her ova would contain either B or b allele. (iv) (d): According to the given passage, within a single family, the sample size of offspring in each generation is very small. Hence, the actual phenotypic and genotypic ratios often deviate from expected ratios. It is only when sample sizes of offspring is large that actual ratios approach theoretical or expected ratios more closely. (v) (c) : Human sperm is haploid, hence they only contain one copy of each gene. Since the man has a bb genotype, his sperm would contain allele b only.

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Case Study Questions Class 10 Science Our Environment

Case study questions class 10 science chapter 15 our environment.

CBSE Class 10 Case Study Questions Science Our Environment. Term 2 Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Our Environment.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 15 marks.

CBSE Case Study Questions Class 10 Science Our Environment

Case Study – 1

1.) Waste management is essential in today’s society. Due to an increase in population, the generation of waste is getting doubled day by day. Moreover, the increase in waste is affecting the lives of many people. Waste management is the managing of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

[ CBSE Academic Question Paper ]

1) Recycling of paper is a good practice but recycled paper should not be used as food packaging because

a) recycled papers take lots of space b) recycled papers can’t cover food properly c) recycled papers can cause infection d) recycled papers are costly

Answer – c) recycled papers can cause infection

2) Effective segregation of wastes at the point of generation is very important. Select the appropriate statements giving the importance of waste segregation.

i) less waste goes to the landfills
ii) better for public health and the environment
iii) help in reducing the waste
iv) resulting in deterioration of a waste picker’s health

a) both i) and ii) b) both i) and iii) c) both ii) and iii) d) both i) and iv)

Answer – a) both i) and ii)

Case Study – 2

1.) Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers. Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

1) If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

a) 10,000 J
d) It will depend on the type of the terrestrial plant.

Answer – b) 100 J

2) Matter and energy are two fundamental inputs of an ecosystem. Movement of

a) Energy is bidirectional and matter is repeatedly circulating.
b) Energy is repeatedly circulation and matter is unidirectional.
c) Energy is unidirectional and matter is repeatedly circulating.
d) Energy is multidirectional and matter is bidirectional.

Answer – c) Energy is unidirectional and matter is repeatedly circulating

3) Mr. X is eating curd/yogurt. For this food intake in a food chain he should be considered as occupying

a) First trophic level
b) Second trophic level
c) Third trophic level
d) Fourth trophic level

Answer – c) Third Trophic level

4 Which of the following limits the number of trophic levels in a food chain?

a) Decrease in energy at higher trophic levels
b) Less availability of food
c) Polluted air

Answer – a) Decrease in energy at higher trophic level

5) The decomposers are not included in the food chain. The correct reason for the same is because decomposers:

a) Act at every trophic level of the food chain
b) Do not breakdown organic compounds
c) Convert organic material to inorganic forms
d) Release enzymes outside their body to convert organic material to inorganic forms

Answer – a) Act at every trophic level of the food chain

Case Study – 3

Food chains are very important for the survival of most species.

1) Which of the following limits the number of trophic levels in a food chain?

Answer – a) Decrease in energy at higher trophic level

2) If Ravi is consuming curd/yogurt for lunch , which trophic level in a food chain he should be considered as occupying ?

Answer – c) Third Trophic level

3) Matter and energy are two fundamental inputs of an ecosystem. Movement of

Answer – c) Energy is unidirectional and matter is repeatedly circulating.

4) If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy ?

Answer – a) Act at every trophic level of the food chain

Case study – 4

In Kunjpura village, located in Karnal district, Haryana, Aditya Aggarwal and his older brother Amit Aggarwal run Tee Cee Industries, a steel plant set up by their ancestors in 1984. Along with this, they also run a gaushala that houses 1,200 cows that can no longer produce milk. The cow shelter was manageable but running the steel plant was turning out to be expensive because they spent a whopping Rs 5 lakh every month on electricity. The brothers struck upon an idea. Why not run the factory with the biogas produced from cow dung from the shelter and other gaushalas, along with bio and agri led Aditya and Amit to start Amrit Fertilizers, a biogas project, in 2014, without any government support.

1) Raw material used in bio gas plant is

(a) Animal dung
(b) crop residue
(c) Food waste
(d) All of the above

Answer – (d) All of the above

2) Biogas is a better fuel than animal dung cake because

(i) Biogas has lower calorific value.
(ii) Animal dung cake has higher calorific value.
(iii) Biogas has high heating capacity.
(iv) Biogas burns without smoke.

(a) (i) only

(b) (ii) only

(d) (i) and (ii)

Answer – (c) (iii) and (iv)

3) Biogas is formed in the

(a) presence of air only.

(b) presence of water only.

(d) presence of water and absence of air.

Answer – (d) presence of water and absence of air.

4) Biogas is a mixture of the following gases.

(a) Ethane,Carbon monoxide, Nitrogen and Butane

(b) Methane,Hydrogen,Carbon dioxide and Nitrogen

(d) Carbon monoxide,Sulphur dioxide and Hydrogen

Answer – (b) Methane, Hydrogen, Carbon dioxide and Nitrogen

CASE STUDY : 5

We are an integral part of the environment. Changes in the environment affect us and our activities change the environment around us

Ozone (O3 ) is a molecule formed by three atoms of oxygen. While O2 , which we normally refer to as oxygen, is essential for all aerobic forms of life. Ozone, is a deadly poison. However, at the higher levels of the atmosphere, ozone performs an essential function. It shields the surface of the earth from ultraviolet (UV) radiation from the Sun.

i) How does ozone is formed?

Ans: The UV radiations coming from the sun split the molecular oxygen into nascent oxygen. When these nascent oxygen combined to molecular oxygen, it forms ozone(O3).

ii) In which layer of atmosphere does ozone is present?

Ans: The ozone is present in the stratosphere layer of atmosphere just above troposphere.

iii) What are the causes for ozone depletion?

Ans: The synthetic chemicals like CFCs ( chlorofluorocarbons) which used as refrigerants amd in the fire extinguisher

iv) Write the chemical reaction for the formation of ozone?

Ans: O2 👉 [O] + [O]

[O] + O2 👉 O3 (ozone)

v) What are the effects of UV radiations?

Ans: It causes different types of cancer in human beings.

CASE STUDY : 6

In our daily activities, we generate a lot of material that are thrown away. What are some of these waste materials? What happens after we throw them away? Let us perform an activity to find answers to these questions.

Collect waste material from your homes. This could include all the waste generated during a day, like kitchen waste (spoilt food, vegetable peels, used tea leaves, milk packets and empty cartons), waste paper, empty medicine bottles/strips/bubble packs, old and torn clothes and broken footwear.
Bury this material in a pit in the school garden or if there is no space available, you can collect the material in an old bucket/ flower pot and cover with at least 15 cm of soil.
Keep this material moist and observe at 15-day intervals.
What are the materials that remain unchanged over long periods of time?
What are the materials which change their form and structure over time?
Of these materials that are changed, which ones change the fastest?

We have seen in the chapter on ‘Life Processes’ that the food we eat is digested by various enzymes in our body. Have you ever wondered why the same enzyme does not break-down everything we eat? Enzymes are specific in their action, specific enzymes are needed for the break-down of a particular substance. That is why we will not get any energy if we try to eat coal! Because of this, many human-made materials like plastics will not be broken down by the action of bacteria or other saprophytes. These materials will be acted upon by physical processes like heat and pressure, but under the ambient conditions found in our environment, these persist for a long time.

i) What is biodegradable substances?

Ans: The substances that are broken down by biological process are called as biodegradable substances.

Eg: Vegetables waste materials.

ii) What are the examples of non- biodegradable substances?

Ans: Plastic, rubber, foam, batteries etc.

iii) what are the ways through which we can reduce pollution especially the non- biodegradable waste?

Ans: •We can use RRR methods i.e reduce, reuse and recycle.

Reduce the use of plastic

iv) What are the effects of biodegradable substances on our environment?

Ans: • Release green house gases.

They are breeding ground for mosquitoes and houseflies causing various disease.

v) What are the non- biodegradable on environment?

Ans: • causes soil pollution and sometimes air pollution when burnt in air.

death of cattles due to ingestion of these waste.
choking of drainage system

CASE STUDY : 7

The food we eat acts as a fuel to provide us energy to do work. Thus the interactions among various components of the environment involves flow of energy from one component of the system to another. As we have studied, the autotrophs capture the energy present in sunlight and convert it into chemical energy. This energy supports all the activities of the living world. From autotrophs, the energy goes to the heterotrophs and decomposers.

i) What is food chain?

Ans: A series of organism feeding on one another and taking part in various biotic levels is called food chain.

ii) Give a example of one terrestrial food chain.

Ans: Sunlight 👉 plants (producers) 👉 Goat/ Deer (herbivores) 👉 Tiger (carnivores)

iii) What are the feature of food chain?

Ans: •It is unidirectional

The energy available at each level gets diminished due to loss at each level.

iv) What do you meant by biological magnification?

Ans: The gradual increase in the concentration of any substance ( generally toxic) in trophic levels is called as biological magnification.

v) What is the average value for the amount of organic matter that is present at each step and reaching the next level of consumers?

CASE STUDY : 8

All organisms such as plants, animals, microorganisms and human beings as well as the physical surroundings interact with each other and maintain a balance in nature. All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem. Thus, an ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals.

i) What is natural ecosystem?

Ans: An environment where living organism and non- living interact with each other freely in nature is called as natural ecosystem.

ii) what are the examples of artificial ecosystem?

Ans: Gardens, crop- fields

iii) what are consumers?

Ans: Organism which consume food either directly or indirectly by feeding on one another animals are called as consumers.

iv) What are the type of consumers?

Ans: They are herbivores, carnivores, omnivores and parasites.

v) What are producers?

Ans: The green plants and some bacteria which make their food by using sunlight i.e photosynthesis are called as producers

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Case Study Questions Class 10 Science Chapter 8 How Do Organisms Reproduce

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Case study Questions Class 10 Science Chapter 8 are very important to solve for your exam. Class 10 Science Chapter 8 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

How Do Organisms Reproduce Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

Case Study/Passage-Based Questions

Question 1:

The male reproductive system consists of portions that produce the germ cells and other portions that deliver the germ cells to the site of fertilization. Testes are located outside the abdominal cavity in the scrotum because sperm formation requires a lower temperature than normal body temperature. It also has a role of secretion of male sex hormone which brings changes in appearance seen in boys at the time of puberty. Vas deferens unites with a tube coming from the urinary bladder. The urethra is a common passage for sperms and urine. The prostate gland and seminal vesicles add their secretions so that sperms are now in a fluid.

(i) Name the sex hormone associated with males. (a) Testosterone (b) Progesterone (c) Oestrogen (d) None of these

Answer: (a) Testosterone

(ii) Which of the following statements is incorrect ? (a) Sperms are present in a fluid (b) Fluid provides nutrition to sperms (c) Fluid makes easier transportation of sperms (d) Fluid helps to bind the sperms together

(iii) Testes are located outside the abdominal cavity in scrotum because (a) sperms formation requires higher temperature than body temperature (b) sperms formation requires lower temperature than body temperature (c) it is easier to transport sperms from the scrotum (d) None of these

Answer: (b) sperms formation requires lower temperature than body temperature

(iv) Which of the following statement is incorrect? (a) Sperms and urine has a common passage from urethra.

(b) Sperms have long tail that helps them to move forward. (c) Sperms contain genetic material. (d) Sperms formation requires 1–3°C higher temperature than normal body temperature.

Answer: (d) Sperms formation requires 1–3°C higher temperature than normal body temperature.

(v) What is the nature of semen? (a) slightly acidic (b) Neutral (c) Slightly basic (d) Strongly basic

Answer: (c) Slightly basic

Question 2:

Rohit collected some pond water which was dark green in color in a test tube. She took out green-colored mass from it and separated its filaments by using needles. She broke some filaments into small fragments and put them in a Petri dish containing clean water. She observed that after a few days the small fragments gave rise to complete filaments.

2.1) What do you think the mass of green filament was ? (a) It was a mass of Spirogyra filament. (b) It was a colony of Volvox algae. (c) It was large brown algae. (d) It was a mass of fungal filaments

Answer:(a) It was a mass of Spirogyra filament.

2.2) Organisms that reproduces in similar ways as Spirogyra is : (a) yeast (b) hydra (c) Planaria (d) Sea anemone

Answer: (d) Sea anemone

2.3) The small fragment gave rise to new filament. What does it indicate ? (a) Spirogyra reproduces asexually through budding. (b) Spirogyra reproduces asexually through spore formation. (c) Spirogyra reproduces asexually through fragmentation. (d) Spirogyra reproduces asexually through fission

Answer: (c) Spirogyra reproduces asexually through fragmentation.

2.4) Which among the following organisms do not reproduce by fragmentation ? (a) Riccia (b) Selaginella (c) Aurelia (d) Marchantia

Answer: (c) Aurelia.

2.5) Select the correct statement from the following. (a) Only multicellular organisms can undergo fragmentation. (b) Both unicellular and multicellular organisms can undergo fragmentation. (c) Fragmentation is sexual mode of reproduction. (d) Fragmentation is found only in algae

Answer: (a) Only multicellular organisms can undergo fragmentation

Question 3:

In humans, if the egg is not fertilized, it lives for about one day. Since the ovary releases one egg every month, the uterus also prepares itself every month to receive a fertilized egg. Thus its lining becomes thick and spongy. This would be required for nourishing the embryo if fertilization had taken place. Now, however, this lining is not needed any longer. So, the lining slowly breaks and comes out through the vagina as blood and mucous. This cycle takes place roughly every month and is known as menstruation. It usually lasts for about two to eight days.

3.1) What is the sexual cycle in human female that takes place every 28 days and marked by bleeding ? (a) Sexual cycle (b) Reproductive cycle (c) Menstrual cycle (d) Blood cycle

Answer: (c) Menstrual cycle

3.2) If fertilisation takes place, it results in the formation of : (a) an embryo (b) a zygote (c) a foetus (d) a placenta

Answer: (b) a zygote

3.3) Why does vaginal bleeding occur in human females on attaining puberty ? (a) Unfertilised egg along with thick uterus lining come out of vagina in form of bleeding. (b) In human females, ovaries start releasing egg or ovum once every 28 days from the age of puberty. (c) If fertilisation does not occur then menstrual flow occurs at the end of cycle. (d) All of these

Answer: (d) All of these

3.4) In what conditions vaginal bleeding will not occur in a human female who has attained puberty ? (a) If the ovum is fertilised (b) If the ovum is not fertilised (c) If there is some hormonal imbalance in female (d) Both (a) and (b)

Answer: (d) Both (a) and (b)

3.5) Mark one change from the following associated with sexual maturation in boys ? (a) loss of milk teeth (b) weight gain (c) increase in height (d) cracking of voice

Answer: (d) cracking of voice

Question 4: A newly married couple does not want have children for few years. They consulted a doctor who advised them barrier method and chemical method of birth control. Yet another couple who already have two children and are middle aged also consulted doctor for some permanent solution to avoid unwanted pregnancy. Doctor advised them surgical method of birth control.

Another category of contraceptives acts by changing the hormonal balance of the body so that eggs are not released and fertilisation cannot occur. These drugs commonly need to be taken orally as pills. However, since they change hormonal balances, they can cause side-effects too. Other contraceptive devices such as the loop or the copper-T are placed in the uterus to prevent pregnancy. Again, they can cause side effects due to irritation of the uterus.

4.1) What are the barrier methods of birth control ? (a) Condoms (b) Oral pills (c) Surgery (d) Both (a) and (c)

Answer: (a) Condoms

4.2) How physical barrier prevent pregnancy ? (a) They kill the sperms. (b) They kill the ovum. (c) They prevent intercourse. (d) They prevent fertilisation

Answer: (d) They prevent fertilisation.

4.3) How chemical methods prevent pregnancy ? (a) Vaginal pills contain chemical called spermicides which kill the sperms. (b) Oral pills prevent ovulation so there will be no fertilisation. (c) Oral pills stop menstruation in females. (d) Both (a) and (b)

Answer: (d) Both (a) and (b)

4.4) Select the correct statement regarding surgical method of birth control. (a) It involves termination of pregnancies in women particularly after eight weeks of conception. (b) Small portion of sperm duct or vas deferences in males is removed by surgical operation and both cut ends are ligated properly. (c) Small portion of oviducts in females is removed by surgical operation and cut ends are ligated. (d) Both (b) and (c)

Answer: (d) Both (b) and (c)

4.5) Select the correct statement regarding birth control methods. (a) Barrier method of birth control also protects the couple from sexually transmitted diseases. (b) Some women experience unpleasant side effects on taking oral pills because of change in hormonal balance in body. (c) Surgical method in males is called vasectomy and in females is called tubectomy. (d) All of these

Answer: (d) All of these

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Chapter 11 The Salt Satyagraha A Case Study| Class 12 History Notes

Class 12 History Notes Chapter 11 The Salt Satyagraha A Case Study discusses that the Salt Satyagraha, also known as the Salt March, Dandi March, and the Dandi Satyagraha, was a nonviolent civil disobedience movement in colonial India.

It was led by Mahatma Gandhi and lasted from March 12, 1930 to April 6, 1930 . The march was a direct-action campaign of tax resistance and nonviolent protest against the British salt monopoly. Gandhi led a large group of people from Sabarmati Ashram to Dandi , a coastal village in Gujarat. The group produced salt from seawater to break the salt law.

In this article, we will look into the topic The Salt Satyagraha A Case Study in detail. It is an important topic in Class 12 History NCERT. Class 12 History Chapter 11 The Salt Satyagraha A Case Study.

What was the Salt Satyagraha?

The Salt Satyagraha, also known as the Salt March, was a nonviolent civil disobedience movement in colonial India. It was led by Mahatma Gandhi and lasted from March 12, 1930 to April 6, 1930.

The march was a direct-action movement against the British salt monopoly, focusing on tax resistance and nonviolence.
Gandhi led a large crowd from Sabarmati Ashram to Dandi, a coastal village in Gujarat. To avoid the salt prohibition, the gang made salt from seawater.
The Salt Satyagraha was a major turning point in the Indian independence movement. It showed the British that Indians were willing to stand up for their rights and that they were united in their opposition to British rule.
The Salt Satyagraha also inspired other movements around the world, including the American Civil Rights Movement. The Salt Satyagraha was a significant event in Indian history.
It was a major turning point in the Indian independence movement and it inspired other movements around the world. The Salt Satyagraha is a reminder of the power of nonviolent civil disobedience and the importance of fighting for justice.

The Salt Satyagraha – A Case Study

Mahatma Gandhi, after the Non-Cooperation Movement ended, focused on social reform. In 1928, he re-entered politics, leading to an all-India campaign against the all-White Simon Commission.

Gandhi did not participate in this movement but gave blessings to a peasant satyagraha in Bardoli.
In December 1929, the Congress held its annual session in Lahore, which marked the election of Jawaharlal Nehru as President and the commitment to “Purna Swaraj” or complete independence.
On January 26, 1930, “Independence Day” was observed, with the national flag hoisted and patriotic songs sung.
Gandhi instructed that the Declaration of Independence should be made by all villages and cities and that meetings should be held at the same time in all places.
Participants would take a pledge affirming the inalienable right of the Indian people to have freedom and enjoy the fruits of their labour.

Mahatma Gandhi announced his intention to lead a march to break the salt monopoly in British India, which gave the state a monopoly over the production and sale of salt.

This was seen as a tactical move by Gandhiji to mobilise wider discontent against British rule. However, the British Raj failed to understand the significance of the action.
On 12 March 1930, Gandhiji began walking towards the ocean, making himself a criminal in the eyes of the law.
Parallel salt marches were being conducted in other parts of India, and the rulers responded by detaining dissenters.
In the wake of the Salt March, nearly 60,000 Indians were arrested, including Gandhiji himself.
The progress of Gandhiji’s march can be traced from secret reports filed by police officials to monitor his movements.
These reports reproduce speeches he gave at villages en route, calling upon local officials to renounce government employment and join the freedom struggle.
In one village, Gandhiji told the upper castes that for Swaraj to be achieved, they must unite Hindus, Muslims, Parsis, and Sikhs.
The American news magazine, Time, initially scorned Gandhiji’s appearance and scepticism about his physical abilities.
However, within a week, Time changed its mind, realizing the massive popularity following the march had garnered and saluting Gandhiji as a “Saint” and “Statesman,” using “Christian acts as a weapon against men with Christian beliefs.”

Significance of Dandi March

The Salt March was a significant event that brought Mahatma Gandhi to world attention, as it was the first nationalist activity in which women participated in large numbers.

It also forced the British government to realize that their Raj would not last forever and that they would have to devolve some power to the Indians.
To achieve this, the British government convened a series of “Round Table Conferences” in London, which led to the Gandhi-Irwin Pact, which called off civil disobedience, released all prisoners, and allowed salt manufacture along the coast.
However, the conference was inconclusive, and Gandhiji returned to India and resumed civil disobedience.
In 1935, a new Government of India Act was proposed, and the Congress won a comprehensive victory in an election held based on a restricted franchise.
In September 1939, the Second World War broke out, and Gandhi and Jawaharlal Nehru promised Congress support to the war effort if the British promised India independence once hostilities ended. However, the offer was refused, and the Congress ministries resigned in protest.
The political landscape became complicated, with the Congress, Muslim League, and British all-party government struggling for control.
In 1942, Churchill sent Sir Stafford Cripps to India to try and forge a compromise with Gandhiji and the Congress, but talks broke down when the Congress insisted that the Viceroy had to appoint an Indian as the Defence Member of his Executive Council.

The Salt March was notable for at least three reasons. First, it was this event that first brought Mahatma Gandhi to world attention.

The march was widely covered by the European and American press. Second, it was the first nationalist activity in which women participated in large numbers.
The socialist activist Kamaladevi Chattopadhyay had persuaded Gandhiji not to restrict the protests to men alone.
Kamaladevi was herself one of the numerous women who courted arrest by breaking the salt or liquor laws.
Third, and perhaps most significant, it was the Salt March that forced upon the British the realisation that their Raj would not last forever and that they would have to devolve some power to the Indians.
To that end, the British government convened a series of “Round Table Conferences” in London. The first meeting was held in November 1930, but without the pre-eminent political leader in India, thus rendering it an exercise in futility.
Gandhiji was released from jail in January 1931 and the following month had several long meetings with the Viceroy.
These culminated in what was called the “Gandhi-Irwin Pact’, by the terms of which civil disobedience would be called off, all prisoners released, and salt manufacture allowed along the coast.
The pact was criticised by radical nationalists, for Gandhiji was unable to obtain from the Viceroy a commitment to political independence for Indians. he could obtain merely an assurance of talks towards that possible end.
A second Round Table Conference was held in London in the latter part of 1931. Here, Gandhiji represented the Congress.
However, his claims that his party represented all of India came under challenge from three parties: from the Muslim League, which claimed to stand for the interests of the Muslim minority; from the Princes.
The Conference in London was inconclusive, so Gandhiji returned to India and resumed civil disobedience. The new Viceroy, Lord Willingdon, was deeply unsympathetic to the Indian leader.

Conclusion – Class 12 History Notes Chapter 11 The Salt Satyagraha A Case Study

In conclusion, Chapter 11 of Class 12 History, “The Salt Satyagraha: A Case Study,” analyzes one of the most memorable moments in India’s struggle for independence. The chapter analyzes the strategic and symbolic significance of nonviolent resistance in facing British colonial control using the Salt Satyagraha as an example.

The Salt Satyagraha, led by Mahatma Gandhi, inspired millions of Indians while also showing the potential of collective action and civil disobedience in the face of injustice. Despite facing repression and jail, the Satyagrahis’ bravery and determination eventually contributed to India’s march toward freedom.

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The Salt Satyagraha A Case Study- FAQ

What is the focus of class 12 history chapter 11.

The chapter focuses on the Salt Satyagraha, an important event in India’s struggle for independence led by Mahatma Gandhi.

The Salt Satyagraha was a nonviolent campaign against British salt monopoly, where Indians protested by making salt from seawater.

What were the objectives of the Salt Satyagraha?

The objectives included challenging British salt laws, asserting Indian self-reliance, and mobilizing mass participation in the nationalist movement.

How did the British respond to the Salt Satyagraha?

The British responded with arrests, repression, and violence against Satyagrahis, including Mahatma Gandhi.

What was the impact of the Salt Satyagraha on India’s independence movement?

The Salt Satyagraha increased national unity, international attention, and marked a significant milestone in India’s journey towards independence.

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Case Study and Passage Based Questions for Class 10 Science Chapter 10
In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. Here, we have provided case … Continue reading Case Study and Passage Based Questions for Class 10 Science Chapter 10 ...
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Class 12 History Notes Chapter 11 The Salt Satyagraha A Case Study discusses that the Salt Satyagraha, also known as the Salt March, Dandi March, and the Dandi Satyagraha, was a nonviolent civil disobedience movement in colonial India.. It was led by Mahatma Gandhi and lasted from March 12, 1930 to April 6, 1930.The march was a direct-action campaign of tax resistance and nonviolent protest ...

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