case study questions class 8 science pdf

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CBSE 8th Standard CBSE all question papers, important notes , study materials , Previuous Year questions, Syllabus and exam patterns. Free 8th Standard CBSE all books and syllabus online. Practice Online test for free in QB365 Study Material. Important keywords, Case Study Questions and Solutions. Updates about latest education news and Scholorships in one place.

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Cbse, ncert and icse solution online, class 8 science case study question, case study question class 8 science (cbse / ncert board).

Class 8 Science Case Study Question and Answer: CBSE / NCERT Board Class 8 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 8 Science.

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell – Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water

For any problem during learning any Case or any doubts please comment us. We are always ready to help You.

CBSE Class 8 Science Case Study Question

• Chapter 1 Crop Production and Management Case Study Question
• Chapter 2 Microorganisms: Friend and Foe Case Study Question
• Chapter 3 Synthetic Fibres and Plastics Case Study Question
• Chapter 4 Materials: Metals and Non-Metals Case Study Question
• Chapter 5 Coal and Petroleum Case Study Question
• Chapter 6 Combustion and Flame Case Study Question
• Chapter 7 Conservation of Plants and Animals Case Study Question
• Chapter 8 Cell – Structure and Functions Case Study Question
• Chapter 9 Reproduction in Animals Case Study Question
• Chapter 10 Reaching the Age of Adolescence Case Study Question
• Chapter 11 Force and Pressure Case Study Question
• Chapter 12 Friction Case Study Question
• Chapter 13 Sound Case Study Question
• Chapter 14 Chemical Effects of Electric Current Case Study Question
• Chapter 15 Some Natural Phenomena Case Study Question
• Chapter 16 Light Case Study Question
• Chapter 17 Stars and the Solar System Case Study Question
• Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

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• Important Questions For Class 8 Science

CBSE Important Questions for Class 8 Science

CBSE Important Questions for Class 8 Science help students face the exams confidently. As the exam nears, they should complete the syllabus and start with the revision. The CBSE Important Questions for Class 8 Science will help them revise the subject quickly. Here, we have compiled the important questions for all the chapters of the CBSE Class 8 Science subject. By solving them, students will understand the types of questions asked in the exam. All types of questions are provided for students’ practice from basic to high level. CBSE Class 8 Science is a fascinating subject and includes interesting topics, thus providing basic knowledge about light, current, force, human beings, etc. Solving these CBSE Class 8 Science Important Questions is the best way to revise the major concepts of the subject.

The subject experts created the questions based exclusively from the exam perspective. Students must start solving them at least 20 days before the annual exam. By doing so, they will be able to analyse their weak areas and work on them. Practising the CBSE Important Questions will improve their performance and overall score in CBSE Class 8 Science exam.

There is a total of 18 chapters in NCERT Class 8 Science book. In the table below, we have provided the Important Questions for CBSE Class 8 Science for all the chapters. We have also included all types of questions, i.e. very short, short and long answers. These questions will cover all the crucial topics and the CBSE Class 8 Science syllabus.

How to Practise the CBSE Class 8 Science Important Questions

• Practise the question of a particular chapter in one go.
• Refrain from looking for the answer while solving the questions.
• Allocate a time duration for solving the questions and try to finish it accordingly.
• After completing all the questions, do a self-evaluation.
• Go through those questions again that could not be solved.

We, at BYJU’S, also provide other study materials such as CBSE Class 8 Science sample papers , notes, exemplars, solutions, etc.

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CBSE Class 8 Science Sample Paper 2023-24 PDF (Free Download)

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Many students don’t achieve or score high marks in their annual examination because they don’t prepare for the exam properly. Therefore, subject matter experts at Selfstudys have prepared the CBSE Class 8 Science Sample Papers to help students in their exam preparation.

These class 8 CBSE sample paper Science are prepared by referring to the prescribed CBSE Class 8 syllabus. Those students who are preparing for their Class 8 annual examination will have to cover their whole syllabus as well as practice tons of questions before the board exam starts.

CBSE Class 8 Science Sample Papers with Solutions

Since the Science questions vary in difficulty levels, students may face trouble in answering all the given problems. Therefore, our subject matter experts have solved the entire set of CBSE Class 8 Science Sample Papers in an easy to understand manner. 

Here on this page, we provide the CBSE Class 8 Science sample papers with solutions in PDF file format. Referring to these CBSE class 8 Science sample papers with solutions PDF, students can easily enhance their performance in the Science examination, because the questions are solved by our subject matter experts keeping in mind the understanding level of a student. They have also kept in mind the CBSE Class 8 Syllabus and exam pattern.

Set Wise CBSE Class 8 Science Sample Papers

The more you practice the better you become, our experts believe in this quote and that is why they have prepared the CBSE Class 8 Science Sample papers in set wise format. On Selfstudys, students are free to download the sample question paper for class 8 Science CBSE in a set wise format. 

CBSE Class 8 Science Sample Paper 2024 Set 1

CBSE Class 8 Science Sample Paper 2024 Set 2

CBSE Class 8 Science Sample Paper 2024 Set 3

CBSE Class 8 Science Sample Paper 2024 Set 4

CBSE Class 8 Science Sample Paper 2024 Set 5

CBSE Class 8 Science Sample Paper 2024 Set 6

CBSE Class 8 Science Sample Paper 2024 Set 7

CBSE Class 8 Science Sample Paper 2024 Set 8

CBSE Class 8 Science Sample Paper 2024 Set 9

CBSE Class 8 Science Sample Paper 2024 Set 10

CBSE Class 8 Science Sample Paper (Term-1) 2021-22 Set - 1

CBSE Class 8 Science Sample Paper (Term-1) 2021-22 Set - 2

CBSE Class 8 Science Sample Paper (Term-1) 2021-22 Set - 3

CBSE Class 8 Science Sample Paper  (Term-1) 2021-22 Set - 5

CBSE Class 8 Science Sample Paper Term-I 2021 Set - 1

CBSE Class 8 Science Sample Paper Term-I 2021 Set - 2

CBSE Class 8 Science Sample Paper Term-II 2021 Set - 1

CBSE Class 8 Science Sample Paper Term-II 2021 Set - 2

The great advantage of referring to the Set Wise CBSE Class 8 Science Sample Papers is that it provides numerous questions that follow the actual annual exam pattern and the syllabus. Apart from this, the PDF that we provide here contains CBSE class 8 Science sample papers with solutions.

How to Download CBSE Class 8 Science Sample Papers for Free

It is absolutely free of cost and easy to Download CBSE Class 8 Science Sample Papers with solutions here at Selfstudys. Follow the below given steps to know how to download

• Open Selfstudys website in your browser

• A popup will appear where you need to click on Sample papers 
• Just after clicking on sample papers, a new page will open where you to click on Class “ 8th ”; like this

• Now, you can click on Science to download CBSE Class 8 Science Sample Papers for Free in set wise format.

Why Someone Needs CBSE Class 8 Science Sample Papers 

Those who want to learn about the questions, their types, marking weightage, etc. need to refer to the CBSE Class 8 Science Sample Papers. It not only helps in this, but Science Sample Question Papers are very helpful in practicing tons of unique questions.

Also, if someone has fear of exams and its environments, they can refer to the sample paper of class 8 Science CBSE SA2, SA1 or any types of class 8 Science papers that can help them to be thorough with the whole Science syllabus.

Who Needs CBSE Class 8 Science Sample Papers

• Those Class 8 students who are studying at a CBSE affiliated school need CBSE Class 8 Science Sample papers. 
• Students who want to be thorough with plenty of questions
• Students looking for additional Science questions to practice apart from their CBSE Class 8 Science Book.
• Those who have fear of classroom tests or annual examination

Is it Worth to Use CBSE Class 8 Science Sample Papers

Solving the CBSE Class 8 Science Sample Papers is worthy as it helps students to understand the questions' difficulty. It also allows them to solve the Science questions that are given in their CBSE Class 8 Science Syllabus.

Being thorough with the CBSE sample paper of class 8 Science enables students to revise the topics and subtopics they covered earlier in their classrooms. Apart from all these worthy points, the class 8 CBSE sample paper Science is helpful in doing the last minute exam preparation.

When is The Right Time to Solve Class 8 CBSE Sample Paper Science

A CBSE class 8 student can solve class 8 CBSE sample paper Science anytime they want, but ideally it should be referred about 3 months before the CBSE class 8 Science half yearly exam or annual exam begins. 

However, there is no hard and fast rule for this tool to use. The sample papers are beneficial for solving various types of questions and so a student can refer to it whenever they want.

Use Class 8 Science Sample Papers to Know Everything About Annual Exam Before Appearing in Them

Our subject matter experts and the teachers suggest the students: use a sample question paper for class 8 Science CBSE before appearing in the annual examination. Doing so helps understand what types of Science questions are asked. Whether the questions are from the syllabus or outside the syllabi. If the questions are from the syllabus, then what Science topics are necessary to cover to score good marks? And how much time is required to solve the whole question paper of Class 8 Science?

This information is helpful and assists in preparing for the CBSE Class 8 Science annual examination. Therefore, students should use class 8 Science sample papers to know everything about annual exams before appearing in them.

Benefits of Practicing CBSE Class 8 Science Sample Papers

A set of CBSE class 8 Science sample papers means a collection of the questions that follow the final exam pattern. Solving such questions before the final examination provides students with support in developing a deeper understanding on how the questions should be answered in the Science examination. Apart from this, there are a few more benefits of practicing CBSE class 8 Science sample papers:

• It helps in revision
• Assist students to be thorough with the Science questions so that answering them in the exam could be easier.
• CBSE sample paper of class 8 Science also enables the students to do the self-analysis. Means they can analyse their level of understanding very easily.

Study Tips for Annual Exam Using CBSE Class 8 Science Sample Papers with Solution

Science subjects require an immense attention of a learner. It is an easy subject to score good marks, but students will have to pay very close attention to types of questions that are asked in the examination such as MCQs, Short answer types of questions, Long answer types of questions, fill in the blanks, etc. However, here are some of the study tips for the annual exam preparation using CBSE Class 8 Science Sample Papers with Solution.

• Before using the CBSE sample paper of class 8 Science to prepare for the exam, firstly cover the whole CBSE Class 8 Syllabus for Science.
• Once done with the Science syllabus go for a quick revision of the entire topics you have studied.
• Then refer to the sample question paper for class 8 Science CBSE to check where you lack in the preparation. The CBSE class 8 Science annual exam sample papers is an ideal study tool that helps students discover the advanced level of questions that may be asked in the actual annual examination.

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Combustion and Flame Class 8 Science Extra Questions and Answers

Combustion and Flame Class 8 Science Chapter 6 Extra Questions and Answers are provided here. We prepared these extra questions based on the latest NCERT Class 8 Science Book. CBSE Class 8 Science Chapter 6 Combustion and Flame Extra Questions will help you to properly understand a particular concept of the chapter.

Class 8 Science Chapter 6 Combustion and Flame Extra Questions

Very short type question.

Question 1: Name some of the substances which burn without producing a flame.

Answer: Coal and Charcoal

Question 2: Name two substances having low ignition temperature.

Answer: paper and white phosphorus

Question 3: Name two substances having high ignition temperature.

Answer: coal and log of wood

Question 4: Name some common fuels.

Answer: wood, charcoal, petrol and kerosene

Question 5: Name some solid fuels.

Answer: wood, charcoal, coal, coke and cow-dung cakes

Question 6: Name some liquid fuels.

Answer: kerosene, petrol and diesel

Question 7: Name some gaseous fuels.

Answer: natural gas, petroleum gas, biogas and coal gas

Question 8: Which is the most common fire extinguisher?

Answer: The most common fire extinguisher is water.

Question 9: Name one substance which burn in air at room temperature?

Answer: Phosphorus burns in air at room temperature.

Question 10: How are heat and light produced in the sun?

Answer: In the sun, heat and light are produced by nuclear reactions.

Question 11: Name the term which is used to express the efficiency of a fuel.

Answer: The term Calorific value is used to express the efficiency of a fuel.

Question 12: Describe one method of putting out a fire caused by burning wood or paper. Or How will you put out a fire caused by burning wood or paper?

Answer: Water can be used when things like wood and paper are on fire.

Question 13: Name the unit in which the calorific value of a fuel is expressed.

Answer: The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).

Question 14: What is global warming?

Answer: Global warming is the rise in temperature of the atmosphere of the earth.

Question 15: What is fuel?

Answer: The substance that undergoes combustion is said to be combustible. It is also called a fuel.

Question 16: Which gas is produced due to incomplete combustion of fuel?

Answer: Incomplete combustion of fuels produces a very poisonous gas called carbon monoxide.

Question 17: Name the fuel which is gradually replacing petrol and diesel in automobiles.

Answer: The use of diesel and petrol as fuels in automobiles is being replaced by CNG (Compressed Natural Gas).

Question 18: What is ignition temperature? Or What is the ignition temperature of a substance?

Answer: The lowest temperature at which a substance catches fire is called its ignition temperature.

Question 19: What is meant by the calorific value of a fuel?

Answer: The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value.

Short Answer Type Questions

Question 1: What are the three zones of flame?

Answer: There are three different zones of a flame – innermost zone (dark zone), middle zone (luminous zone) and outer zone non-luminous zone.

Question 2: What is combustion? Give example.

Answer: A chemical process in which a substance reacts with oxygen to give off heat is called combustion. Example: Burning of charcoal.

Question 3: Why food is called fuel for our body?

Answer: Food is called fuel for our body because in our body food is broken down by reaction with oxygen and heat is produced.

Question 4: Why is the innermost zone of a flame black in colour?

Answer: The innermost zone of a flame is black in colour due to presence of unburnt vapours of the combustible material.

Question 5: Explain how CO 2 is able to control fires.

Answer: CO 2 , being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.

Question 6: Which is the best fire extinguisher for fires involving electrical equipment and inflammable materials like petrol?

Answer: For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2 ) is the best extinguisher.

Question 7: Why is water not used to control fires involving electrical equipment? Or Explain why fire caused by electricity should not be extinguished by pouring water? Or Why water is not suitable for extinguishing fire caused due to electrical appliances? Or Why can we not use water to extinguish fire caused due to electrical appliances?

Answer: Water is not used to control fires involving electrical equipment because water may conduct electricity and harm those trying to douse the fire.

Question 8:  What are the harmful products released by the burning of fuels?

Answer: The harmful products released by the burning of fuels are unburnt carbon particles, carbon monoxide, carbon dioxide, sulphur dioxide, nitrogen oxides etc.

Question 9: What is rapid combustion? Give one example.

Answer: The combustion that takes place rapidly and produces heat and light is called rapid combustion. Example: Gas burns rapidly and produces heat and light.

Question 10:  Why are fires produced by burning oil not extinguished by pouring water? Or Water is not suitable for fires involving oil and petrol. Explain. Or The fire produced by petrol cannot be extinguished by using water. Explain why?

Answer: Water is heavier than oil.  So, it sinks below the oil, and oil keeps burning on top. Thus, water is also not suitable for fires involving oil and petrol.

Question 11:  What causes global warming?

Answer: Combustion of most fuels releases carbon dioxide in the environment. Increased concentration of carbon dioxide in the air is believed to cause global warming.

Question 12: What are the effects of global warming?

Answer: Global warming results in the melting of polar glaciers, which leads to a rise in the sea level, causing floods in the coastal areas. Low lying coastal areas may even be permanently submerged under water.

Question 13: What is combustible substance? Give some examples.

Answer: The substance that undergoes combustion is said to be combustible substance. Some of the combustible substances are wood, coal, charcoal, paper, dry leaves, petrol etc.

Question 14: What is non-combustible substance? Give some examples.

Answer: The substance that does not burn is said to be non-combustible substance. Some of the non-combustible substances are soil, stone, glass, water etc.

Question 15: Can you burn a piece of wood by bringing a lighted matchstick near it? Explain.

Answer: The ignition temperature of a piece of wood is high which cannot be reached by the small heat produced by a burning matchstick. So, a matchstick cannot light (or burn) a piece of wood directly.

Question 16: How forest fires occur during the hottest summer days? Or Why do forest fires occur during hot summers?

Answer: During hot summers, sometimes the ignition temperature of dry grass in the forest is reached, which makes the dry grass catch fire. From grasses, it spreads to trees, and very soon the whole forest is on fire.

Question 17: Why does cooking oil catch fire if a frying pan is kept on the burning stove for a long time?

Answer: Cooking oil catch fire if a frying pan is kept on the burning stove for a long time because the cooking oil gets heated to its ignition temperature when kept over a burning stove for a long time.

Question 18: What chemicals can put out a fire?

Answer: Carbon dioxide (CO 2 ) is the best extinguisher. Another way to get CO 2 is to release a lot of dry powder of chemicals like sodium bicarbonate (baking soda) or potassium bicarbonate. Near the fire, these chemicals give off CO 2 .

Question 19: Why do you have to use paper or kerosene oil to start fire in wood or coal?

Answer: Wood or coal has a high ignition temperature, so a wood or coal fire cannot be started by using a lighted matchstick directly. Thus, we use paper or kerosene oil to start fire in wood or coal.

Question 20: Explain why we are advised not to sleep in a closed room with a coal fire burning. Or Why is it not advisable to sleep in a closed room with burning coal in the fireplace during winters?

Answer: Incomplete combustion of fuels gives carbon monoxide gas. It is a very poisonous gas. It is dangerous to burn coal in a closed room. The carbon monoxide gas produced can kill persons sleeping in that room.

Question 21: Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. Give reason.

Answer: The heat supplied to the paper is transferred to aluminium pipe by conduction. So, in the presence of aluminium pipe, the ignition temperature of paper is not reached. Hence, it does not burn.

Question 22: How is fire caused by electricity extinguished?

Answer: For fires involving electrical equipment, carbon dioxide (CO2) is the best extinguisher. CO2, being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.

Question 23: What are inflammable substances? Give examples.

Answer: The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG), etc.

Question 24: Which zone of a flame does a goldsmith use for melting gold and silver and why?

Answer: Goldsmith use the outermost zone of the flame for melting gold and silver because in the outermost zone (or non-luminous zone) of a flame, complete combustion of the fuel takes place and is the hottest part of the flame.

Question 25: What is the colour of the different zones of a flame?

Answer: A flame consists of three zones:

• The innermost zone of a flame is dark (or black)
• The middle zone of a flame is yellow.
• The outer zone of a flame is blue.

Question 26: It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Answer: It is difficult to burn a heap of green leaves because it contains a lot of moisture and hence its ignition temperature is high. But dry leaves catch fire easily because it contains no moisture and hence its ignition temperature is low.

Question 27: What is spontaneous combustion? Give one example.

Answer: The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion. Example: Burning of white phosphorous on its own at room temperature.

Long Answer Type Questions

Question 1: How does pouring water extinguish a fire?

Answer: Water cools the combustible material so that its temperature is brought below its ignition temperature. This prevents the fire from spreading. Water vapours also surround the combustible material, helping in cutting off the supply of air. So, the fire is extinguished.

Question 2: What is explosion? Explain with the help of example.

Answer: When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. A large amount of gas formed in the reaction is liberated. Such a reaction is called explosion. Explosion can also take place if pressure is applied on the cracker.

Question 3: Why some substances burn with a flame while as some burn without a flame?

Answer: The substances which vapourise during burning, give flames. For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames. Charcoal, on the other hand, does not vapourise and so does not produce a flame.

Question 4: In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

Heat produced from 4.5 kg of a fuel = 180,000 kJ

Heat produced from 1 kg of a fuel = 180,000 kJ ÷ 4.5 kg = 40000 kJ/kg

Question 5: List conditions under which combustion can take place. Or What are the conditions necessary for combustion to take place?

Answer: There are three conditions which are necessary for combustion to take place. These are:

• Presence of a combustible substance (fuel)
• Presence of air or oxygen
• Heating the combustible substance to its ignition temperature

Question 6: When the clothes of a person catch fire the person is covered with a blanket to extinguish fire. Can you guess why? Or Why is a person whose clothes have caught fire wrapped in a thick blanket? Or Why do we cover a burning person in the blanket as a first aid? Or What should be done if the clothes of a person catch fire accidentally? Why?

Answer: When the clothes of a person catch fire the person is covered with a blanket to extinguish fire because when the burning clothes of a person are covered with a blanket, the supply of air to the burning clothes is cut off and hence the burning stops.

Question 7: What does a fire brigade do when it arrives at a place where a building is on fire? Or When a fire brigade arrives at a place where a building is on fire, what does it do?

Answer: It pours water on the fire. Water cools the combustible material so that its temperature is brought below its ignition temperature. This prevents the fire from spreading. Water vapours also surround the combustible material, helping in cutting off the supply of air. So, the fire is extinguished.

Question 8: Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?

Answer: The water in the Ramesh’s beaker will heat up in shorter time. This is because outermost part of the flame is the hottest part of the flame whereas the yellow zone of the flame (the middle zone of a flame or luminous zone) in which Abida kept the beaker produces moderate temperature.

Question 9: Can the process of rusting be called combustion? Discuss.

Answer: A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The rust is formed when iron slowly combines with the oxygen present in air (in the presence of moisture) to form iron oxide. The process of rusting of iron is a slow combustion and liberates very little heat but no light.

Question 10: State any three characteristics of an ideal fuel. Or What are the characteristics of an ideal fuel? Or What is an ideal fuel?

Answer: Characteristics of an ideal fuel

• An ideal fuel is cheap, readily available, readily combustible and easy to transport.
• It has a high calorific value.
• It does not produce gases or residues that pollute the environment.

Question 11: What is acid rain? How is acid rain harmful? Or What are the causes and effects of acid rain?

Answer: Burning of coal and diesel release sulphur dioxide gas. It is an extremely suffocating and corrosive gas. Moreover, petrol engines give off gaseous oxides of nitrogen. Oxides of sulphur and nitrogen dissolve in rain water and form acids. Such rain is called acid rain. It is very harmful for crops, buildings and soil.

Question 12: If a can full of kerosene catches fire, what is the simplest way to put off this fire?

Answer: A small fire can be extinguished by throwing sand or soil over it. When sand is thrown over burning kerosene oil, the sand covers it like a blanket. The sand cuts off the air supply to the burning kerosene oil due to which the fire gets extinguished. For heavy fires involving inflammable materials carbon dioxide (CO2) is the best extinguisher.

Question 13: What is explosive combustion? Give one example.

Answer: A very fast combustion reaction in which a large amount of heat, light and sound are produced is called explosive combustion. A large amount of gases is released quickly. It is the rapid expansion of these gases which causes a loud sound. Example: fireworks on festival days. When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound.

Question 14: Place a piece of burning wood or charcoal on an iron plate or Tawa. Cover it with a glass jar or a tumbler, or a transparent plastic jar. Observe what happens. Does charcoal stop burning after sometime? Can you think of the reason why it stops burning?

Answer: When a burning wood or charcoal is covered with a glass jar or a tumbler, it stops burning after sometime, that is, the charcoal fire gets extinguished after some time. This is so, because when we cover the burning wood or charcoal, the supply of supporter of combustion (i.e. air) to the burning wood or charcoal is cut off and hence the charcoal fire stops.

Question 15: Explain how the use of CNG in automobiles has reduced pollution in our cities.

Answer: Burning of fuel like petroleum releases unburnt carbon particles and gases like carbon monoxide, carbon dioxide, sulphur dioxide and nitrogen oxides into the air. These pollutants can cause many respiratory diseases and environmental hazards. CNG produces the harmful products in very small amounts. CNG is a cleaner fuel. Thus, the use of CNG in automobiles has reduced pollution in our cities.

Question 16: Arrange the following fuels in the increasing order of their calorific value. cow dung cake, petrol, wood, LPG, hydrogen

Question 17: Make a labelled diagram of a candle flame.

Answer.  Different Zones of candle flame is shown below

Question 18: What is matchstick made of? Or How do matchsticks work? Or Does a matchstick burn by itself? How does it burn?

Answer: These days the head of the safety match contains only antimony trisulphide and potassium chlorate. The rubbing surface has powdered glass and a little red phosphorus (which is much less dangerous). When the match is struck against the rubbing surface, some red phosphorus gets converted into white phosphorus. This immediately reacts with potassium chlorate in the matchstick head to produce enough heat to ignite antimony trisulphide and start the combustion.

Question 19: Compare LPG and wood as fuels. Or Why is LPG a better domestic fuel than wood?

Answer: LPG and wood as fuels

• For centuries, wood was used as domestic and industrial fuel. But now it has been replaced by coal and other fuels like LPG.
• LPG has much higher calorific value than wood, so it produces much more heat on burning than an equal mass of wood.
• LPG burns without producing any smoke but burning of wood produces a lot of smoke which is very harmful for human beings.
• LPG burns completely without leaving behind any solid residue but wood leaves behind a lot of ash on burning. Thus, LPG is a cleaner fuel compared to wood.
• LPG does not causes environmental problem but cutting of trees for wood leads to deforestation which is quite harmful to the environment.

Question 19: What are the harmful effects of burning fuels?

Answer: The increasing fuel consumption has harmful effects on the environment.

• Carbon fuels like wood, coal, petroleum release unburnt carbon particles. These fine particles are dangerous pollutants causing respiratory diseases, such as asthma.
• Incomplete combustion of these fuels gives carbon monoxide gas. It is a very poisonous gas.
• Combustion of most fuels releases carbon dioxide in the environment. Increased concentration of carbon dioxide in the air is believed to cause global warming.

Question 20: Make two paper cups by folding a sheet of paper. Pour about 50 mL of water in one of the cups. Heat both the cups separately with a candle. What do you observe?       a.   What happens to the empty paper cup and why?       b.   What happens to the paper cup with water and why?       c.   Does water in this cup become hot?

Answer: (a) The empty paper cup catches fire easily and starts burning because the ignition temperature of paper reaches quickly.

(b)  When we heat the paper cup containing water, then the heat supplied to the paper cup is transferred to water inside it by conduction. So, in the presence of water, the ignition temperature of paper cup is not reached, and hence the paper cup does not catch fire.

(c) Yes, the water in this paper cup becomes hot gradually.

Question 21: How will you show that air is necessary for combustion? Or Write an activity to show that oxygen is necessary for combustion. Or How would you show that air is needed for combustion? Or How will you show that air is essential for burning fuels? Or What will happen if a burning candle is covered with a glass jar? Or Write an experiment to show that air is essential for burning.

Answer: Fix a lighted candle on a table. Put a glass chimney over the candle and rest it on a few wooden blocks in such a way that air can enter the chimney. We will see that candle burns freely in case (a) when air can enter the chimney from below. Now remove the blocks and let the chimney rest on the table.

Now, we will observe that in case (b), when air does not enter the chimney from below, the flame flickers and produces smoke. Finally, put a glass plate over the chimney. Here, in case (c), the flame finally goes off because the air is not available.

This observation shows that air is necessary for combustion (or burning) to take place.

Question 22: Explain the structure of candle flame with diagram.

Answer:  A flame consists of three zones.

• The innermost zone of a flame is dark (or black) – It consists of hot, unburnt vapours of the combustible materials. It is the least hot part of the flame.
• The middle zone of a flame is yellow – It is bright and luminous. The fuel vapours burn partially in the middle zone because there is not enough air for burning in this zone. This zone produces a moderate temperature. This zone is the major part of a candle flame.
• The outer zone of a flame is blue – It is a non-luminous zone. In this zone, complete combustion of the fuel takes place because there is plenty of air around it. This zone has the highest temperature in the flame.

At Study Path, you can also learn more about Class 8 Science Chapter 6 Combustion and Flame by accessing the free exhaustive list of study materials and resources related to the chapter such as NCERT Solutions, Notes, Important Questions, and MCQ.

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• Important Questions for CBSE Class 8 Science Chapter 1 - Crop Production and Management

CBSE Class 8 Science Chapter-1 Important Questions - Free PDF Download

Class 8 is very important as the preparation of the board examination starts here. The concepts that you are going to learn in class 8 is going to help you to perform well in class 9 and also in the board examination. Understanding the concepts is important. The first chapter of the class 8 science book is Crop Production and Management. The chapter deals with concepts like agricultural practices in India, how the soil is prepared to grow crops. Manures and fertilizers, along with the irrigation process, are also discussed in this chapter. Topics like irrigation, protection of crops, harvesting, and storage of crops are also mentioned in the first chapter of the class 8 science book. Students may find it challenging to understand the topics in this chapter. So it is better to practice class 8 science chapter 1 important questions t o prepare themselves better for the final examination.

Vedantu is a platform that provides free CBSE NCERT Solution and other study materials for students. You can also download NCERT Solutions for Class 8 Maths and NCERT Solution for Class 8 Science to help you to revise co mplete syllabus and score more marks in your examinations.

Important Questions for Class 8 Science Chapter 1 – Free PDF Download

Multiple choice questions                                                                1 mark.

1. The instrument ‘combine’ is used for.

A. Sowing of seeds B. Harvesting the crops

C. Threshing D. Both harvesting and threshing

Ans: A correct option is an option (D) Both harvesting and threshing

2. Which one of the following statements is True about the storage of produce?

i. Harvested grains have less moisture.

ii. Farmers store grains in jute bags or metallic bins.

iii. Small scale storage of grains is done in silos and granaries

iv. Specific chemical treatments are required to protect crops from pests and microorganisms.

A. ii only B. i, ii and iv

C. ii and iv D. iii and iv

Ans: A correct option is an option (C) ii and iv

3.   is the festival associated with the harvest season.

A. Dussehra B. Ganesh Chaturthi

C. Baisakhi D. Christmas

Ans: A correct option is option (C) Baisakhi

4. Rajeev is a farmer. He has ploughed the field but needs to level it. Which one of the following can he use to level the field?

A. Leveller B. Harvester

C. Cultivator D. Seed drill

Ans: The correct option is option (A) leveller

5. Which one of the following is NOT a source of water for irrigation.

A. Tubewells B. Dams

C. Lakes D. Oceans

Ans: The correct option is option (D) ocean

6. Which one of these crops is cultivated during the winter season.

A. Cotton                 B. Linseed

C. groundnut D. Paddy

Ans: The correct option is option (B) linseed

Fill in the Blanks

1. Removal of unwanted and uncultivated plants are called.

2. The same kind of plants cultivated at one place on large scale is called.

3. Is the cutting of the mature crop manually or by machines.

Ans:  Harvesting

4. Proper storage of grains is necessary to protect them from and .

Ans: Pests, Microorganisms

Short Answer Questions                                          2/3 Marks

1. Differentiate between Kharif and rabi crops.                               (3)

Ans: The difference between Kharif and rabi crops is:  

2. Identify the instrument given below and write a short note on it. (1 + 2)

Ans: The seed drill is the equipment.

Seed drills are being used in combination with tractors to plant seeds. Seed drills assure that seeds are planted evenly and at the same depth. During planting, the seed drill covers the seed with dirt, preventing birds from eating it.

3. Give four examples of fertilizers. (2)

Ans: Urea, ammonium sulphate, superphosphate, potash, NPK etc.

4. What do you mean by the term irrigation? (2)

Ans: Irrigation is the process of providing water to crops at regular intervals. Irrigation timing and frequency differ from crop to crop, soil to soil, and season to season.

5. If a handful of seeds are given to you, how will you separate healthy seeds from damaged ones? (2)

Ans: Fill a beaker halfway with water, add some seeds into it, and mix well. Set alone for a while. You'll notice that some seeds sink while others float. Damaged seeds become hollow and lighter, which allows them to float on water.

6. Describe briefly animal husbandry? (3)

a. Animal husbandry is the field of agriculture that deals with animals that provide meat, fiber, milk, or eggs.

b. It involves daily care, selective breeding, and livestock keeping. Animals, like plants, offer humans a wide range of food products for which they are grown domestically or commercially.

c. They are given adequate food, housing, and care, which is referred to as animal husbandry .

7. Why do you think the removal of weeds is essential? Write any one method to control weeds. (2 + 1)

Ans: Weed removal is necessary because weeds compete with crops for water, nutrients, and other fundamental requirements, causing crop development to be limited and yields to low.

Weeds are routinely removed near to the ground with the use of Khurpi. Another option is to use weedicides such as 2,4 D to control weeds

8. What is crop rotation? Why is it important? (2 + 1) 

Ans: Crop rotation is a way of restoring nutrients in the soil by planting various crops in order. Growing legumes as fodder one season and wheat the next is one example. It is significant because it aids in nitrogen replenishment in the soil.

9. List the advantage of manure over fertilizers. (3)  

a. The water holding capacity of the soil improves by Manure.

b. The texture of the soil improves by Manure.

c. The number of friendly microbes increases by Manure.

10. Define harvesting. (2)

Ans: The cutting of mature crops manually or by machines is known as Harvesting. Harvesting of crops can be done either by pulling out the crops from the field or cutting them close to the ground. In our country, Harvesting is either done by sickle or by a harvester machine.

11. Choose the odd one out and give reason for the same. (1 + 1)

moat, dhekli, sickle, rahat

Ans:  Sickle stands out as the odd one out. All of the others are ancient irrigation systems, but a sickle is a tool used to harvest crops.

12. Correct the following statements. (1 + 1)

a. The separation of grains from the chaff is called weeding.

Ans: The separation of grains from the chaff is called threshing/winnowing.

b. Manure is a man-made inorganic salt.

Ans:   Fertiliser is a man-made inorganic salt.

Long Answer Questions 5 Marks

1. Farmers practise several agricultural activities over a period of time. 

a. List all the activities performed by the farmers during the cultivation of crops.

Ans: The activities involved are

Preparation of soil

Adding manure and fertilisers

Protecting from weeds

b. Explain any one activity in detail.

Ans:  Adding manure and fertilizers: (Answer may vary)

Manure and fertilisers are given to the soil in the form of nutrients for the healthy development of plants.

Plants require vital nutrients from the soil to flourish. Crop cultivation continues to reduce the soil's nutrients. As a result, farmers must apply manure to their crops in order to restore the soil's nutrients. Manuring is the term for this procedure.

Manure is an organic material formed when plant or animal excrement decomposes. Organic manure is made from decomposing materials.

2. Explain in detail about agricultural implements used during the preparation of soil.  

Ans:  The main tools used for this purpose are plough, hoe and cultivator.

Plough: A plough is a tool made of wood or iron that is used to till or plough a field. Apart from tilling the soil, it is utilized for a variety of tasks such as crop fertilizing process, clearing weeds, and so on. A pair of bulls or other animals, such as camels or horses, pull this tool.

Hoe: A hoe is a basic instrument that is used to pull weeds from the soil and soften the soil. It has a long wooden or iron rod. A blade-like device is attached to one of its ends by a strong, wide, and bent plate of iron. Animals drag it along.  

Cultivator: Nowadays, a tractor-driven cultivator is used to plough. The usage of a cultivator saves both time and labour.

3. Why is the storage of produce important? Briefly describe the methods involved.

Ans:  Storage of produce is important because

a. If harvested grains are to be stored for an extended period of time, they must be protected from dampness, insects, rats, and microbes.

b. Grain that has been harvested has higher moisture. If those grains are not dried before storing, they may degrade or become infected with organisms, rendering them unsuitable for use or germination. As a result, the grains are adequately dried in the sun before being stored to minimise moisture content. Insects, pests, bacteria, and fungus are all prevented by this method.

c. Jute bags or metal bins are used by farmers to store crops. Large-scale grain storage, on the other hand, is done in silos and granaries to keep pests like rodents and insects away.

d. At home, dried leaves of neem are used to store food grains.

e. To preserve huge amounts of grains stored in large godowns from pests and microbes, special chemical treatments are necessary.

4. Write a short note on the following modern methods of irrigation. 

a. Sprinkler System

Ans:  

Sprinkler System: This method is particularly helpful on uneven terrain where there isn't enough water. At regular intervals, the perpendicular pipes with revolving nozzles on top are connected to the main pipeline. Water flows from the revolving nozzles when it is permitted to flow under pressure via the main pipe with the support of a pump. As though it were sprinkling, it is sprayed on the crop. Sprinklers are particularly handy for lawns, coffee plantations, and a variety of other crops.

b. Drip Irrigation System

Drip System: The waterfalls exactly near the roots in this arrangement, drop by drop. As a result, it's known as a drip system. It is the most effective method for watering fruit trees, gardens, and trees since no water is wasted. It's a gift in areas where there's a shortage of water.

The Crop Production and management chapter is designed to give the students a better understanding of the harvesting process of various crops that is very important in daily life. As there are more than one crop and multiple growing processes according to the time of the year the crops are being harvested, it is not easy for the students to remember all the things. A huge syllabus of various subjects and a lack of understanding and revision can prove to be a roadblock in the way of a good result in the final examination. To overcome the hurdles, you need to understand the essential concepts well and also need to revise the chapter time and time again. To prepare well for the examination students need to practice all the important questions from chapter 1. All these questions have been explained effectively on Vedantu website.

Now let us find out the topics covered in chapter 1 of Class 8.

Important Topics Covered in Chapter 1 of Class 8

Agricultural Practices

Basic Practices of Crop Production

Preparation of Soil (Agricultural Implements)

Sowing (Selection of Seeds)

Adding Manure and Fertilisers

Differences between Fertiliser and Manure

Traditional Methods of Irrigation

Modern Methods of Irrigation

Protection from Weeds

Food from Animals

Crop Production and Management Class 8 Important Questions

Important questions of chapter 1 of the science book of class 8 will help the students to gain theoretical knowledge about the production of the crop and the after production process. Practising these questions numerous times can help a student to write them properly in the final examination without any hiccup, and the answers are efficient enough to provide a student with good marks. The following is a brief concept of the chapter :

Definition and Type of Crops

Plants that are grown and cultivated to be letter consumed as food and after a certain period harvested are known as crops. There are various types of crops. They are –

Rabi Crops - Crops grown in between October and March, means during the winter season.

Kharif Crops - Crops are sown during the rainy season, which means from July to October.

Preparation of Soil

The quality of the soil is one of the most important factors that the farmers look for before sowing a crop. Soil preparation is done by using various tools and techniques as the production of crops depends on the soil.

Ploughing, which is also known as tilling, is the process by which the loosening and turning of the soil are done by using tools called plough, cultivator and hoe. Plough is a tool that many farmers use to add fertilizers in the soil, to remove weeds from the soil for the improvement of its quality. The tip of it is triangular and made by using the iron. The shaft attached with it is made by using wood. The other end of the shaft is placed on the bull’s neck with the help of a beam. Nowadays the wooden ploughs are replaced with iron ploughs. Hoe is also a device used for the digging purpose of soil. Most of the farmers now take the help of technology. Cultivators that are attached to the tractor are now used instead of ploughs for faster loosening of the soil.

Sowing of Seeds

The plantation of seeds is known as sowing. In the sowing process cultivator or plough is used as the loosening of soil is very important for sowing seeds. At the first stage, the seeds are sorted based on quality. The selection process is done by putting all the seeds in the water where the good seeds sink deep in the water while the seeds in the damaged condition float on the water. A tractor is used in the sowing process of seeds. Seed drills are used by the farmers to sow the seeds uniformly in the land at the desired depth.

Germination of Seeds

Germination means when a plant starts to emerge from a seed. The germination process takes place when the seeds are watered properly after being sown in the land.

The Fertility of the Soil

The soil needs to be fertile for the germination process of seeds. Fertilizers and pesticides are used to improve the quality of the soil. By adding fertilizers soil quality can be improved. Manures are made with decomposed organic substances like leaves, flowers. On the other hand, fertilizers are made by using mostly inorganic chemicals. Excessive use of fertilizers can increase the pH level of the soil and can also cause soil pollution and water pollution. Sometimes lands need to be left fallow for a certain period. In that period the land can regain the nutrients and can again be used for agricultural purposes.

Rotation of Crops

To keep the fertility of the soil intact crop rotation is important. Crop rotation means that the same crop does not grow on the same land. Different crops require different nutrients. By sowing different seeds, the fertility of soil can be restored.

Weed Removal

Weeds are plants that grow naturally on the field that can damage the crop. Weeds absorb all the nutrients, space, and water, and nothing lefts for the crop. Removal of weeds is necessary. Processes like tilling are used for weed removal along with weedicides. Tilling is discussed earlier. Weedicides are chemicals that are being used to kill weeds in the land. Manual methods are also there. The manual method means the removal of weeds by chopping them from the ground level.

Harvesting means when the crop is cut after the crop gets mature. Harvesting can be done in both manual and artificial ways. The manual method of harvesting is done by using a sickle. The artificial process is done by using a machine called a harvester.

Threshing and Winnowing

Grains cannot be consumed directly. They need to be loosened from the chaff and the process is known as threshing. Nowadays, machines are used for the threshing process. To separate grain seeds from the chaff help of wind is also taken and it is known as winnowing. Due to wind pressure grains that are heavier fall down, and the lighter chaff flies away.

Storage of Crops

After all the process storage of the harvested crops is done, the grain needs to be stored in a dry place away from the moisture to prevent any kind of fungal infestation. The place where the freshly harvested grains are stored is known as granaries.

Animal Husbandry

The management of animals that are being used in the farms and the harvesting process is known as animal husbandry.

Class 8 th Science Chapter 1 Important Questions

We ease the learning process of a student by enlisting important questions from the first chapter of the science of class 8 that can come in the final examination.

What are the two main types of crops? Give examples of each type of crop.

When are Rabi and Kharif Crops sowed in the soil?

What are the tools that are being used in the loosening of the soil?

Why is the rotation of crops important?

Define the process of irrigation and also discuss the methods of irrigation.

How can irrigation conserve water?

State the differences between manures and fertilizers.

Describe the threshing and winnowing process.

Why is the overuse of chemical fertilizer harmful?

How are good seeds selected before sowing?

Benefits of Important Question of Class 8 Science Chapter 1

The Crop Production and Management chapter helps students to secure good marks in the examination as almost all questions carrying almost 20 marks can come in the examination. The overall percentage will improve significantly if you read the answers to important questions along with class 8 science chapter 1 extra questions thoroughly. Few benefits that one can gain from the important questions for class 8 science chapter 1 are –

When a student will see these questions in the examination, he or she will not get tense.

Science chapter 1 class 8 important questions are collected with the help of thorough research, and a huge possibility is there that the questions will come in the examination.

All the class 8 th science chapter 1 important questions and topics are discussed easily and simply.

Class 8 science chapter 1 important questions can help a student to prepare for the final examination.

The Crop Production and Management chapter is a very important chapter in the class 8 science book. The important questions as mentioned on Vedantu website will help the students to understand the important topics. Regular practice of the answers to the important questions can boost a student’s examination preparation.

FAQs on Important Questions for CBSE Class 8 Science Chapter 1 - Crop Production and Management

1. What are some of the important questions of Class 8 Science Chapter 1 - Crop Production and Management?

As per Vedantu’s free PDF of important questions for Class 8 Science Chapter 1 Crop Production and Management, the following are some of the important questions:

• Differentiate between Kharif and rabi crops.
• What do you mean by the term irrigation?
• Describe briefly animal husbandry.
• What is crop rotation? Why is it important?
• List the advantages of manure over fertilisers.
• Define harvesting.

2. Which site provides the free PDF of Important Questions for Class 8 Science Chapter 1?

Vedantu, India’s best online learning platform, provides the PDF of Important Questions for Class 8 Science Chapter 1 Crop Production and Management. Vedantu has been in the ed-tech business for more than a decade and it is known to offer chapter-wise study materials. This includes Important Questions for Class 8 Science Chapter 1 Crop Production and Management. At Vedantu, students are assured of well-researched materials prepared by subject matter experts who have a vast knowledge of the subject and years of teaching experience. Important Questions for Class 8 Science Chapter 1 include important questions for exam preparation along with their answers prepared by experts.

3. How can I build an in-depth knowledge of NCERT Class 8 Science Chapter 1 Crop Production and Management?

Class 8 Science Chapter 1 Crop Production and Management is an important chapter in the CBSE syllabus. Students can build a solid knowledge of the chapter by practising a range of questions provided by Vedantu. However, students need to first read the chapter properly from the NCERT textbook before referring to the Important Questions PDF. Students can avail of Important Questions for Class 8 Science Chapter 1 provided by expert teachers at Vedantu to practice extra questions during the exam and for concept building. Apart from that, students can register for Master Classes for doubt resolution by experts on Vedantu.

4. What are the benefits of practising Vedantu’s Important Questions for Class 8 Science Chapter 1 Crop Production and Management?

Class 8 Science Chapter 1 Crop Production and Management is an important chapter from an exam perspective. Students can download the online repository of Important Questions for Class 8 Science Chapter 1 Crop Production and Management. The free PDFs of important questions are popular among students. All the problems included in the PDF are solved by expert teachers and these explanations can be used while writing answers for exams. Students can prepare well for the exam with the help of Important Questions for Class 8 Science Chapter 1 Crop Production and Management. The free PDFs designed by Vedantu are prepared as per the latest syllabus and exam pattern. This will improve students’ knowledge of the chapter immensely. It will also improve their marks in exams.

5. What is a crop according to Chapter 1 of Class 8 Science?

Plants that are cultivated on a large scale for consumption are known as crops. These plants include ragi, wheat, rice, corn, and so on. The plant product can also be referred to as crops if they are sold commercially for consumption. Crops are a daily necessity for humans and some animals. Humans consume crops like wheat, rice, and so on. Though each crop has its own season and cannot be cultivated throughout the year.

6. What is crop production and management according to Chapter 1 of Class 8 Science?

Various methods used in the cultivation of plants and animals for food and fibre are known as crop production and management. It is a branch of agriculture that includes maintaining and producing the necessary crops based on their cultivating and harvesting season. There are several steps like soil preparation, sowing, manure and fertilisers, harvesting, and storage involved in the whole process of crop production and management. Hence, it is tedious to look after the crops. To study more important questions like this, students can download the PDF of important questions free of cost from Vedantu’s website(vedantu.com) or mobile app.

7. How can nitrogen be replenished in soil naturally according to Chapter 1 of Class 8 Science?

The Nitrogen in the air is converted into chemical forms through the process of the Nitrogen cycle. Plants and animals cannot inhale nitrogen directly from the atmosphere, so microbes like soil bacteria and fungi help in the nitrogen fixation and replenish the nitrogen in the soil naturally. This is an ongoing process with four steps and requires no interference. The bacteria and fungi break down the Nitrogen in the surrounding into multiple chemical forms.

8. What is the name of Chapter 1 of Class 8 Science?

The first chapter in Science for Class 8th is Crop Production and Management. In this chapter, the students learn about different varieties of crops and different methods by which they are produced and managed. They also get knowledge about the cultivating seasons for each type of crop and fertilisers used on them. Lastly, students get an insight into the harmful effects of certain fertilisers due to the ingredients used to make them. To know more, students can visit the Vedantu app or website.

9. Why is it important to protect the plants from weeds?

While cultivating crops there is a need to look after the unwanted plants that grow beside the crops. These plants are called weeds and are removed via a process called weeding. It is important to protect the plants from weeds because these unwanted plants affect the growth of the crops and take away the necessary nutrients from the soil. You can study the process in detail in Chapter 1 of Class 8th Science.

Chapterwise Important Questions for CBSE Class 8 Science

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Case Study Questions for Class 8 Science Chapter 2 Microorganisms-Friend and Foe

• Last modified on: 10 months ago
• Reading Time: 6 Minutes

Here we are providing case study questions for CBSE Class 8 science Chapter 2 Microorganisms-Friend and Foe.

Case Study Questions

Question 1:

Daksh lived in delhi and he loves to play football. But as of now his half yearly exams were going on so his mother didn’t allow him to go out and play. She promised Daksh that as soon as his exams are over he can go and play. Post exams he went out to play football with his friends in the park. Suddenly a mosquito bit him under his left knee. He came home and everything was normal that time. The next day his health started getting affected. His Parents rushed him to the doctor. The doctor prescribed some medicines and some medical tests. The next day parents went to the doctor with Daksh’s medical report. In that report the platelet counts were very low. The doctor diagnosed him with Dengue fever. Daksh was hospitalised for some time and followed a strict diet to recover as early as possible. And eventually some days passed and he recovered.

Q. 1. Organisms which cannot be seen by naked eye. (a) Plants (b) Animals (c) Microorganisms (d) None of these

Q. 2. The causative organisms of dengue is (a) Anopheles mosquito (b) Aedes aegypti mosquito (c) Dengue virus (d) None of these

Q. 3. How does dengue virus spread?

Q. 4. Write any three preventive measures for dengue fever.

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