cameroon gce O level June 2024 human biology 2
cameroon gce O level June 2024 human biology 2
SECTION A
Answer THREE questions from this Section
(a) How do humans differ from other mammals?
(b) State two functions of each of the following cell organelles: ‘
(i) Nucleus (ii) Mitochondrion (iii) Endoplasmic reticulum (iv) Lysosome
Define each of the following terms:
(i) Diffusion (ii) Osmosis (iii) Active transport.
1. (6 marks)
(8 marks)
(c)
(2, 2, 2 marks)
Total = (20 marks)
(8 marks)
(8 marks)
(a) Draw a large and neatly labelled diagram to show the structure of the motor neurone
(b) Describe how nerve impulses are transmitted across the synapse
(c) State two roles played by each of the following hormones in the human body:
Oxytocin (ii) Adrenaline.
2.
(2, 2 marks)
Total= (20 marks)
(0
State the roles played by each of the following food nutrients in the human body:
(i) Carbohydrates (ii) Proteins (iii) Lipids.
Describe the role of:
( i) the liver (ii) the pancreas in the digestion of lipids.
j. (a)
(5, 5, 4 marks)
(b)
(3, 3 marks)
Total= (20 marks)
Name the cellular components of blood and give a function for each.
Draw a large and neatly labelled diagram to show the longitudinal section of the human heart.
4. (a) (6 marks)
(b)
(8 marks)
(6 marks)
Total = (20 marks)
(c) In tabular form, distinguish between blood plasma and lymph.
Define the following terms as used in reproduction:
( i) Menstruation (ii) Ovulation (iii) Ejaculation (iv) Afterbirth.
What are the advantages of birth control to a couple?
5. (a)
(2, 2, 2, 2 marks)
(4 marks)
Red-green colour blindness is a recessive sex-linked trait in humans. Using N to represent the allele
for normal vision and n to represent the allele for red-green colour blindness, determine the
possible genotypes and phenotypes of the offspring of a man with normal vision and a woman who
(b)
(c)
is a carrier for red-green colour blindness. (8 marks)
Total = (20 marks)
SECTION B
Answer TWO questions from this Section
6. (a) Define the term photosynthesis.
How is a green leaf adapted to carry out photosynthesis?
With the aid of an illustrated diagram only, show how water circulates in an ecosystem (7 marks)
State the role played by producers in an ecosystem.
(3 marks)
(b) (7 marks)
(c)
(d) (3 marks)
Total = (20 marks)
7. (a) Why is it necessary to administer First aid to an accident victim? (4 marks)
What First aid measures would you use to rescue a person who has been electrocuted? (4 marks)
Using the headings: Causative agent, a mode of transmission and two preventive measures,
write short notes on:
(b)
(c)
(4, 4, 4 marks)
Total = (20 marks)
Dih
October 3, 2024
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