form 4 biology essay questions

Form 1 Mathematics Notes
Form 2 Mathematics Notes
Form 3 Mathematics Notes
Form 4 Mathematics Notes
Form 1 Mathematics Topical Questions and Answers
Form 2 Mathematics Topical Questions and Answers
Form 3 Mathematics Topical Questions and Answers
Form 4 Mathematics Topical Questions and Answers
Form 1 Functional Writing Notes
Form 2 Functional Writing Notes
Form 3 Functional Writing Notes
Form 4 Functional Writing Notes
Poetry Notes
Grammar Notes
Oral Literature Notes
Oral Skills Notes
Guide to Blossoms of the Savannah Summarized Notes - Easy Elimu
A Doll's House
The Pearl Study Guide
Memories We Lost and Other Stories Study Guide
Inheritance Study Guide
A Silent song and Other Stories Guide
Fathers of Nations Guide
An Artist of the Floating World Guide
The Samaritan Guide
Sarufi na Matumizi ya Lugha
Isimu Jamii Notes
Fasihi Notes
Ushairi Notes
Mwongozo wa Kuandika Insha
Tumbo Lililoshiba na Hadithi Nyingine
Mwongozo wa Kigogo
Mwongozo wa Chozi La Heri - Chozi la Heri Notes PDF
Mwongozo wa Bembea ya Maisha - Bembea ya Maisha Notes PDF
Mwongozo wa Nguu za Jadi
Mwongozo wa Mapambazuko ya Machweo na Hadithi Nyingine
Biology Form 1 Notes
Biology Form 2 Notes
Biology Form 3 Notes
Biology Form 4 Notes
Biology Essays
Form 1 Biology Topical Revision Questions and Answers
Form 2 Biology Topical Revision Questions and Answers
Form 3 Biology Topical Revision Questions and Answers
Form 4 Biology Topical Revision Questions and Answers
Form 1 Chemistry Notes
Form 2 Chemistry Notes
Form 3 Chemistry Notes
Form 4 Chemistry Notes
All Chemistry Practicals Notes for KCSE and MOCKS
Form 1 Chemistry Topical Revision Questions and Answers
Form 2 Chemistry Topical Revision Questions and Answers
Form 3 Chemistry Topical Revision Questions and Answers
Form 4 Chemistry Topical Revision Questions and Answers
IRE Form 1 Notes
IRE Form 2 Notes
IRE Form 3 Notes
IRE Form 4 Notes
Physics Form 1 Notes
Physics Form 2 Notes
Physics Form 3 Notes
Physics Form 4 Notes
CRE Form 1 Notes
CRE Form 2 Notes
CRE Form 3 Notes
CRE Form 4 Notes
Geography Form 1 Notes
Geography Form 2 Notes
Geography Form 3 Notes
Geography Form 4 Notes
History Form 1 Notes
History Form 2 Notes
History Form 3 Notes
History Form 4 Notes
Business Studies Form 1 Notes
Business Studies Form 2 Notes
Business Studies Form 3 Notes
Business Studies Form 4 Notes
Home Science Form 2 Notes
Home Science Form 3 Notes
Home Science Form 4 Notes
Home Science Form 1 Notes
Agriculture Form 1 Notes
Agriculture Form 2 Notes
Agriculture Form 3 Notes
Agriculture Form 4 Notes
Agriculture KCSE 2019 Project
Computer Studies Form 1 Notes
Computer Studies Form 2 Notes
Computer Studies Form 3 Notes
Computer Studies Form 4 Notes
KCSE 2017 Reports
2018 Pre-Mocks
2019 Pre-Mocks
2022 Pre Mocks
2021/2022 Pre-Mock Past Papers
2023 Pre Mocks
2017 Mock Past Papers
2019 Mock Past Papers
2020 Mock Past Papers
Mock Exam Papers 2021/2022 - Easy Elimu
Mock Exam 2022 Questions and Answers
Alliance Boys High School
Maranda High School
Form 1 Past Papers
Form 2 Past Papers
Form 3 Past Papers
Form 4 Past Papers
2019 KCSE Prediction Papers
2020 KCSE Prediction Papers
2021 KCSE Prediction Papers
2022 KCSE Prediction Questions and Answers - EasyElimu
KCSE Prediction 2023
2020 Post Mock Past Papers
2021/2022 Post Mocks
2023 Post Mocks
Play Group: Activities, Homework and Syllabus
2023 PP1 Exams
2023 PP2 Exams
Grade 1 Notes
2023 Grade 1 Exams
Grade 2 Notes
2023 Grade 2 Exams
Grade 3 Notes
2023 Grade 3 Exams
Grade 4 Notes
2023 Grade 4 Exams
Grade 5 Notes
2023 Grade 5 Exams
Grade 6 Notes
KPSEA Exams
2023 Grade 6 Exams
Class 6 : Notes, Revision Papers and Syllabus
Class 7 : Notes, Revision Papers and Syllabus
Class 8 Notes
2023 Class 8 Exams
2023 Kcpe Prediction
Grade 7 Notes
2023 Grade 7 Exams
The New EasyElimu Website
Form 4 End Term 1 Exams
Form 3 Exams 2024
Form 2 End Term 1 Exams
Form 1 End Term 1 Exams
All Kiswahili setbook guides
All English setbook guides
Form 1 - 4 High School Notes

Biology Paper 1 Questions and Answers - Form 4 End Term 1 Exams 2021

« Previous Topic Physics Paper 3 Questions and Answers - Form 4 End Term 1 Exams 2021

Next Topic » Biology Paper 2 Questions and Answers - Form 4 End Term 1 Exams 2021

BIOLOGY FORM 4 END TERM EXAMS TERM 1 2021 PAPER 1 (THEORY) TIME 2 hrs

INSTRUCTIONS

Answer ALL the questions
Plasma membrane.
State two ways by which leaves of plants are adapted to gaseous exchange. (2mks)
State a function of aerenchyma tissue. (1mk)
Identical (2mks)
Fraternal (1mk)
State three functions of an exoskeleton. (3mks)
What is meant by destarching a leaf? (1mk)
State two ways in which sunlight increases the rate of transpiration. (2mks)
List two features of flowers that attract insect pollinators. (2mks
State two adaptations of pelvic girdle to its functions. (2mks)
Name the type of joint found between the femur and pelvic girdle. (1mk)
Give two ways in which red blood cells are adapted to carry out their functions. (2mks)
Name chemical forms in which carbon IV oxide is transported in the human body. (2mks
Name any two divisions of the kingdom plantae. (2mks
Name the hormone produced in human body when one takes in a large amount of water. (1mk)
What disease results from the inadequate production of the hormone in 12(a) above? (1mk)
Give one disadvantage of using pesticide to eliminate the ticks. (1mk)
What is the role of water in germinating seeds? (2mks)
State two limitations of fossil records as an evidence for organic evolution theory. (2mks)
State an ideal that led to the formulation of larmacks theory of evolution. (1mk)

Draw the appearance of the seedling after three days. (1mk)
Explain your observations (a) above. (2mks)

How many nitrogenous bases code for a single amino acid? (1mk)
Why are animal cells put in isotonic solution when performing an experiment? (2mks)

Suggest the aim of the experiment. (1mk)
Account for the results observed at the end of the experiment. (2mks)

……
Name the process by which water passes from the soil to the part labeled A. (1mk)
Nitrosomonas
Nitrobacter
Azotobacter
Teeth (1mk)
Saliva (1mk)
Distinguish between prokaryotic and eukaryotic cells. (2mks)
Prokaryotic cells (1mk)
Eukaryotic cells(1mk)
The lungs(1mk)
Active muscles(1mk)
State two main characteristics of organisms in kingdom fungi. (2mks)
State two adaptations of fruits dispersed by wind. (2mks)
Describe how white blood cells fight against infection. (2mks)
A drop of a person’s blood shows clumping with the anti-B serum but not with anti-A serum. State the person blood group. (1mk)
Calculate the diameter of the cells in micro-metre given that the diameter of the field of view is 3mm and that they are 10 cells across the field of view, the total magnification was 100x. ((2mks)
Apart from AIDs, name one diseases of the reproductive system in man that is caused by viruses. (1mk)
State one way by which HIV/AIDs is transmitted from mother to child. (1mk)

Name parts (2mks) A C
What is the role of part D? (1mk)
State two roles of progesterone. (2mks)
What is parthenocarpy? (1mk)

MARKING SCHEME

Plasma membrane. - Control movement of materials in and out of the cell;
Ribosome - Site of protein synthesis;
Presence of stomata to allow passage of gases;
Presence of intercellular spaces/air passages to allow free circulation of air;
Thin to allow easy diffusion of gases;
Flattened shape to offer large surface area of air to reach cells;
Moist inner surface of cells to allow easy diffusion of gases;
Exposure to air to allow easy diffusion of gases;
It allows for gaseous exchange between the shoot and the root
Identical (2mks) - a fertilized ovum divided into two; and develops into two separate embryos;
Fraternal (1mk) - two different ova are fertilized;
Attachment of muscle;
Protect inner delicate tissues from mechanical damage;
Prevent entry of pathogens;
Prevent drying of organisms;
Process by which the leaf is made devoid of starch; by keeping it in dark (about 48 hours); so that all starch present is used up.
By increasing internal leaf temperature thus high rate of evaporation of water from the leaf;
By increasing the size of stomata opening aperture hence large surface area for water loss;
Brightly colored petals;
Sweet scented nectar from nectarines (nectarines glands);
They have a depression/socket on the side of ileum; which articulates with end of femur to form a ball and socket joint.
They have a hole;
Obturator foramen has a small aperture;
Public symphosis is made of flexible cartilage;
Hard to support upper part of body;
Bones are fused to form firm frame to support body.
Ball and Socket
lack of nucleus increasing the surface area of haemoglobin package;
Small in size to squeeze in the small capillaries;
Numerous/many to increase surface for efficient transport of oxygen;
Biconcave to increase the surface area for oxygen to diffuse in
Mark only first two .
Weak carbonic acid;
hydrogen carbonate;
Spermatophyte;
Pteridophyta;
ADH/ Vasepresin;
Diabetes insipidus; rej. Water diabetes
Cow. - Primary consumer;
Tick - Secondary consumer;
Pollutes environment;
kill non-targeted organisms Mark first one
Hydrolysis of stored food;
Acts as a solvent for hydrolysed foods;
Medium of transport;
Activation of enzymes for hydrolysed foods;
Medium for enzymatic reactions;
Soften seed coat to allow plumule and radical to come out
Marked only first two
Desctruction of fossils by geological activities;
Distortion of information due to sedimentation;
Missing records; (only first two)
the theory of need;
the theory of use and disuse;
acquired traits can be inherited;

Rotating the seedling will evenly distribute the Auxins (on shoot and root); resulting to uniform growth (shoot and foot grow horizontally);

To maintain osmotic pressure of the cells in the tissue; to as to obtain accurate results.
To indicate the burning food produces carbon IV oxide;
To show water was produced when food burns; (Only first one)
Lime water form white precipitate; to show that carbon IV oxide is produced;
blue cobalt II chloride turns pink; due to the presence of water produced when food burns
- cell vacuole;
- cell wall;
- cell/plasma membrane;
Nitrosomonas - Converts Ammonia to nitrites;
Nitrobacter - Converts nitrites to nitrates;
Azotobacter - Fix nitrogen into ammonia which is then converted to nitrates;
Teeth - Cut and grind food to increase surface area for digestion; and easy swallowing.
Saliva - contain water which is a medium for chemical reactions; and acts as a solvent. -contain salivary amylase/ptyalin which digests starch to maltose. Any first one.
Prokaryoli – nuclear materials not membrane bound (naked;)
Eukaryotic – nuclear bound by membrane; NB-Use sentence connectors)
Prokaryotic cells - Monera; (1mk)
Eukaryotic cells - Protoctista/plantae/animalia/fungi; (1mk)
The lungs - oxygen; (1mk)
Active muscles- carbon IV oxide; lactic acid. (1mk)
Eukaryotic;
Lack chlorophyll;
Basic unit isophae; (only first two.)
are small and light to be carried easily by wind;
Have hair like structures or floss to increase buoyancy in the air;
Develop wing-like extensions to increase surface area for increased buoyancy in the air; (only first two.)
By engulfing and digestion pathogens;
By secretion of antibodies; which destroy pathogens and their products.
blood group B;
Size of cell = diameter of field of new = No of cells = (3×1000) / 10 = 300µm. Actual size = 300 / 100
Hepatitis B;
Breast feeding;
Through placenta;
Name parts (2mks) A - axon; C - cell body;
Speed up the transmission of the impulses;
growth of mammary glands
Inhibit FSH;
Inhibit prolactin release
Prevents construction of myometrium; (Only first two)
Formation of fruit without fertilization

Download Biology Paper 1 Questions and Answers - Form 4 End Term 1 Exams 2021 .

Why download.

✔ To read offline at any time.
✔ To Print at your convenience
✔ Share Easily with Friends / Students

What does our community say about us?

Join our community on:.

KCSE Revision Questions
Privacy Policy
Mobile App Privacy Policy
High Schools in Kenya
Teacher Resources
Questions and Answers
Online Tuition and Classes in Kenya

IMAGES

Biology Form 4 Chapter 4 Essay Question
Biology Form 4 Chapter 4 Essay Question
Biology form 4 chapter 6 essay questions
Biology Form 4 Chapter 4 Essay Question
Biology form 4 essay questions chapter 2
BIology Form 4

VIDEO

Form 4 Biology KSSM Chap 2: Cell Biology & Organisation [Part 1]
Biology Form 4 Genetics Notes Tutorial (Part 1)
SPM KSSM BIOLOGY MADE EASY 1
KSSM Form 4 Biology Essaybook
Biology Form 4 KSSM Chapter 12 COORDINATION AND RESPONSE IN HUMANS 12. 1
Full Paper Biology Revision

COMMENTS

Biology Paper 1 Questions and Answers
BIOLOGYFORM 4END TERM EXAMSTERM 1 2021PAPER 1(THEORY)TIME 2 hrs INSTRUCTIONS Answer ALL the questions State the functions of each of the following organelles: (2mks) Plasma membrane. Ribosome     State two ways by which leaves of plants are adapted to gaseous exchange. (2mks) State a funct...