Biology Form Four 2024 NECTA.

As an AI, I do not have access to specific exam questions. However, I can provide you with a general overview of the topics typically covered in a Biology Form Four exam according to the NECTA syllabus:

1. Cell Biology:
- Cell structure and function
- Cell division
- Cell transport mechanisms

2. Genetics:
- Inheritance
- Variation and evolution
- Genetic engineering

3. Ecology:
- Ecosystems
- Population dynamics
- Conservation biology

4. Human physiology:
- Digestive system
- Respiratory system
- Circulatory system
- Excretory system
- Nervous system
- Endocrine system

5. Reproduction:
- Human reproductive system
- Reproductive health
- Fertilization and development

6. Microbiology:
- Microorganisms
- Disease transmission
- Immune response

7. Biotechnology:
- Applications of biotechnology in medicine, agriculture, and industry

It is important to review your class notes, textbooks, and past exam papers to prepare for your Biology Form Four exam in 2024. Good luck with your studies!

Biology Form Four 2024 NECTA

Section A: Multiple Choice (40 marks)

1. Which of the following is NOT a characteristic of living organisms?
(a) Growth
(b) Inertness
(c) Reproduction
(d) Metabolism

2. The basic unit of life is the:
(a) Cell
(b) Tissue
(c) Organ
(d) Organism

3. Which of the following is the primary site of photosynthesis in plants?
(a) Chloroplast
(b) Mitochondria
(c) Golgi apparatus
(d) Nucleus

4. The process by which plants absorb water and minerals from the soil is called:
(a) Osmosis
(b) Diffusion
(c) Transpiration
(d) Absorption

5. Which of the following is a function of the exoskeleton in arthropods?
(a) Protection
(b) Movement
(c) Reproduction
(d) Digestion

6. The hormone responsible for the development of female secondary sexual characteristics is:
(a) Estrogen
(b) Progesterone
(c) Testosterone
(d) Insulin

7. Which of the following is a disadvantage of sexual reproduction?
(a) Produces more genetically diverse offspring
(b) Requires only one parent
(c) Can result in harmful mutations
(d) Is less efficient than asexual reproduction

8. The theory of evolution by natural selection was proposed by:
(a) Gregor Mendel
(b) Charles Darwin
(c) Louis Pasteur
(d) Alfred Russel Wallace

9. Which of the following is an example of a decomposer?
(a) Bacteria
(b) Fungi
(c) Algae
(d) Green plants

10. The conservation of forests is important because it:
(a) Provides habitats for wildlife
(b) Regulates the climate
(c) Prevents soil erosion
(d) All of the above

Section B: Short Answer (30 marks)

1. Describe the structure and function of a mitochondrion.
2. Explain the process of meiosis and its significance in genetic diversity.
3. Discuss the role of hormones in the regulation of plant growth.
4. Describe the different types of immunity and their importance in protecting the body from infections.
5. Discuss the factors that affect the rate of population growth.

Section C: Essay (30 marks)

1. Discuss the strengths and weaknesses of the Lamarckian and Darwinian theories of evolution.
2. Explain the importance of biodiversity and describe the threats it faces.
3. Describe the stages of the human reproductive cycle and discuss the hormonal control of these stages.
4. Discuss the applications of biotechnology in modern society, considering both the benefits and risks associated with this technology.
5. Analyze the factors that contribute to the development of cancer and describe the different strategies used for its treatment.