Past paper

Form 4 Biology national exam 2024 with answers

The 2024 Form 4 national exam paper for Form 4 Biology, question by question. Take it timed like the real exam, then see the answer and explanation to every question.

62 questions, 100 marks
120 minutes

Take this paper

120 minutes, 100 marks. Multiple choice is marked for you; you mark your written answers against the marking points.

A free account is needed to start, so your answers and results are saved.

Instructions to candidates

Answer all questions in the ANSWER BOOKLET.

SECTION A: MULTIPLE CHOICE: CIRCLE THE LETTER OF THE CORRECT ANSWER [20 MARKS]

1
The diagram below represents a portion of the human body. The principal function of structure X is to
- A.Absorb water
- B.Secrete insulin
- C.Produce bile
- D.Secrete amylase
1 mark
2
Iodine is necessary for the synthesis of which of the following hormones?
- A.Adrenaline
- B.Auxin
- C.Thyroxine
- D.Insulin
1 mark
3
Which of the following is the correct sequence in the circulation of blood?
- A.Heart → arteries → arterioles → capillaries → venules → lymph → heart
- B.Heart → arteries → arterioles → capillaries → veins → venules → heart
- C.Heart → arteries → arterioles → capillaries→ venules → veins → heart
- D.Heart → arterioles → arteries → capillaries → venules → veins → heart
1 mark
4
A diagram of the human female reproductive system is shown. Where does implantation normally occur?
- A.W
- B.X
- C.Y
- D.Z
1 mark
5
The smallest unit of classification in taxonomic units is
- A.Genus
- B.Species
- C.Family
- D.Order
1 mark
6
The process by which green plants make their own food from carbon dioxide and water by using sunlight energy in the presence of chlorophyll, is called:
- A.Photosynthesis
- B.Respiration
- C.Photolysis
- D.Excretion
1 mark
7
The figure below shows a section through a pea flower. Which part attracts animals for pollination to take place?
- A.F
- B.J
- C.G
- D.L
1 mark
8
Which hormone is produced when blood sugar level decreases?
- A.Insulin
- B.Thyroxine
- C.Glucagon
- D.Adrenaline
1 mark
9
Fertilization results immediately in the formation of:
- A.A zygote
- B.An embryo
- C.A placenta
- D.A fetus
1 mark
10
Which one of the following is NOT a part of the human male reproductive system?
- A.Testis
- B.Oviduct
- C.Seminal vesicle
- D.Prostate gland
1 mark
11
The diagram below shows a plant cell in which part does photosynthesis takes place?
- A.1
- B.2
- C.3
- D.4
1 mark
12
which of the following is responsible for the Green color of plants?
- A.chlorophyll
- B.melanin
- C.basophil
- D.leucoplasts
1 mark
13
The process of digestion of food in humans is completed in:
- A.Stomach
- B.food pipe
- C.mouth
- D.small intestine
1 mark
14
Females possess softer skin than males due to the presence of a hormone that causes the softness and smoothness of skin. This hormone is:
- A.Testosterone
- B.Prolactin
- C.Progesterone
- D.Estrogen
1 mark
15
Which of the following organelles is responsible for energy production of the cell?
- A.Ribosomes
- B.Lysosomes
- C.Mitochondria
- D.Golgi body
1 mark
16
.......... Are organisms which contain foreign DNA that has been introduced using biotechnology:
- A.Mutated organism
- B.Transgenic organisms
- C.Genetic organisms
- D.Hybrid organisms
1 mark
17
Which of the following is the correct path taken by urine in our body?
- A.kidney → ureter → urethra → bladder
- B.kidney → bladder → urethra → ureter
- C.bladder → kidney → ureter → urethra
- D.kidney → ureter → bladder → urethra
1 mark
18
The faulty functioning of an endocrine gland can make a person very short or very tall. This gland is:
- A.Thyroid
- B.Pineal
- C.Adrenal
- D.Pituitary
1 mark
19
Select the group which shares the Maximum number of common characters:
- A.Two individuals of a species
- B.Two species of a genus
- C.Two genera of a family
- D.Two genera of two families
1 mark
20
If a black cow (Bb) were crossed with a white cow (bb) what would be the phenotypic ratios of the offspring?
- A.3:1 black to white
- B.0:4 black to white
- C.1:2 black to white
- D.1:1 black to white
1 mark

SECTION B: COMPLETION QUESTIONS (10 MARKS)

Use the words in the box: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology

B1
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. The human circulatory system is made up of (i) heart, (ii)_____ and (iii)_____
1 mark
B2
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. Those animals which eat only plants are called_____
1 mark
B3
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. The axial skeleton consists of 80 bones and appendicular skeleton consists of_____ bones.
1 mark
B4
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. _____ is the branch of biology that deals with the study of interactions among organisms and their environment.
1 mark
B5
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. _____are gamete-producing organs (ovaries in females and testes in males).
1 mark
B6
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. The liquid part (or fluid part) of blood is called_____
1 mark
B7
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. _____is the basic structural and functional unit of living organisms.
1 mark
B8
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. The two types of reflex actions are_____ and _____
1 mark
B9
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. The mass of the human brain is about 1.4kg and it uses 20% of the _____ that reaches the body.
1 mark
B10
Word bank: Gigantism, gonads, blood and blood vessels, oxygen, herbivores, plasma, simple and conditioned, 126, cell, ecology. In children who are still growing, too much growth hormone can cause a condition called_____
1 mark

SECTION C: MATCH THE TERMS IN COLUMN A WITH SUITABLE DESCRIPTION WITH COLUMNS (10 MARKS)

C1
Match the term in Column A with a suitable description in Column B. Term: CNS. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C2
Match the term in Column A with a suitable description in Column B. Term: Spermatophya. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C3
Match the term in Column A with a suitable description in Column B. Term: Organ. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C4
Match the term in Column A with a suitable description in Column B. Term: Ligase. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C5
Match the term in Column A with a suitable description in Column B. Term: Pancreas. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C6
Match the term in Column A with a suitable description in Column B. Term: Pollution. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C7
Match the term in Column A with a suitable description in Column B. Term: Botany. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C8
Match the term in Column A with a suitable description in Column B. Term: Arthritis. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C9
Match the term in Column A with a suitable description in Column B. Term: Arties. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark
C10
Match the term in Column A with a suitable description in Column B. Term: Eczema. Column B: acts as both endocrine and exocrine gland; blood vessels that carry blood away from heart; an inflammation of the joints; one of the common skin disorders; a Group of tissues working together; enzyme that joins the adjacent strands of DNA fragments; the brain and the spinal cord; the scientific study of plants; atmospheric change that threatens biodiversity; seed producing plants.
1 mark

SECTION D: STRUCTURED QUESTIONS (60 MARKS)

D1a
The diagram below shows a plant during photosynthesis. Name gas X (3 marks)
3 marks
D1b
The diagram below shows a plant during photosynthesis. Name gas Y (3 marks)
3 marks
D2
What is the difference between the axial and appendicular skeletons? (6 marks)
6 marks
D3
Complete the diagram below which shows a partly filled section of a DNA molecule (4 marks). (Diagram: four base pairs; given bases C, A, (blank) paired with T, G; boxes to use: A, C, G, T.)
4 marks
D4a
The diagram shows a typical animal-pollinated flower. Name the structures A, B and C (3 marks)
3 marks
D4b
The diagram shows a typical animal-pollinated flower. Give one function for each structure A and B (4 marks).
4 marks
D4c
The diagram shows a typical animal-pollinated flower. What does the ovule develop into if fertilization occurs? (2 marks)
2 marks
D5a
If the sequence of ATCGGCAT is a part of DNA: what is the complementary DNA strand? (3 marks)
3 marks
D5b
If the sequence of ATCGGCAT is a part of DNA: what is the complementary RNA strand? (3 marks)
3 marks
D6a
The diagram below shows the bones and two of the Muscles in the human arm. Name the parts labelled A, B and C (3 marks)
3 marks
D6b
The diagram below shows the bones and two of the Muscles in the human arm. Name the types of joints present in the parts labeled X and Y. (2 marks)
2 marks
D6c
The diagram below shows the bones and two of the Muscles in the human arm. What will happen to the Muscle C when the muscle B contracts? (1 mark)
1 mark
D7a
The figure below shows a food web (grass, locust, scorpion, baboon, leopard, impala, tick, tick bird, snake, hawk, seed-eating bird). Name an organism from this food web that is a producer (1 mark)
1 mark
D7b
The figure below shows a food web (grass, locust, scorpion, baboon, leopard, impala, tick, tick bird, snake, hawk, seed-eating bird). Name an organism from this food web that is a primary consumer (1 mark)
1 mark
D7c
The figure below shows a food web (grass, locust, scorpion, baboon, leopard, impala, tick, tick bird, snake, hawk, seed-eating bird). Name an organism from this food web that is a secondary consumer (1 mark)
1 mark
D8a
The Figure below is a diagram of the elbow joint: Name the type of joint illustrated in Figure (2 marks)
2 marks
D8b
The Figure below is a diagram of the elbow joint. People who suffer from arthritis experience pain because certain parts of the joint are worn away. Identify the TWO most common types of arthritis (2 marks)
2 marks
D9a
Answer each of the following questions: What are the names of the male sex hormone, and the female sex hormones (4 marks)?
4 marks
D9b
Answer each of the following questions: What name is Given to the fusion of sperm and ovum? (2 marks)
2 marks
D9c
Answer each of the following questions: What is the name of the tissue through which the fetus gets all the requirements from the mother's body? (2 marks)
2 marks
D10a
Albinism is a recessive trait in humans. Two normal parents have an albino child. What is the probability that their next child will be Normal (4 marks)
4 marks
D10b
Albinism is a recessive trait in humans. Two normal parents have an albino child. What is the probability that their next child will be Albino (4 marks)
4 marks

Paper set by the Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Shared free of charge to help students prepare. The answers and explanations are written by Sheerxirfad teachers.

Other Form 4 Biology past papers

All units of Form 4 Biology