Human Biology Past GCE Questions O/L 2023

SECTION A:

ANSWERS THREE QUESTIONS FROM THIS SECTION

Q1. (a) Define the following terms giving an example of each case:

(i) Cell (3 marks)

(ii) Tissues (3 marks)

(b) Describe the structure of the following muscles tissues:

(i) Skeletal muscles(3 marks)

(ii) Smooth muscles(3 marks)

(iii) Cardiac muscles (3 marks)

(c.) In a tabular form, distinguish between mitosis and meiosis (5 marks)

Q2. (a) Define the following terms;

(i) Ligament (2 marks)

(ii) Tendon (2 marks)

(b) Draw and labeled the hip joint (5 marks)

(c.) Give the functions of the human skeleton (6 marks)

(d) State five factors that influence healthy bones and muscles development in humans (5 marks)

Q3. (a) Draw and labeled the transverse section of the human ear (8 marks)

(b) List two ear defects in humans and state the cause of each (4 marks)

(c.) Describe the sequence of events that occur in the body when someone accidentally touches a hot iron. (8 marks)

Q4. (a) What are the characteristics of a good respiratory surface? (4 marks)

(b) Describe the mechanism of gaseous exchange in humans (12 marks)

(c.) State four differences between aerobic and anaerobic respiration (4 marks)

Q5. (a) Draw a large and neatly labeled diagram of the male gametes (sperm cell) (6 marks)

(b) State four female secondary sexual characteristics (4 marks)

(c.) Defined the following terms as used in genetics, giving an example of each case.

(i) Genotype (2 marks)

(ii) Phenotype (2 marks)

(d) A woman whose blood group was O, married a man whose blood group was B.

(i) Explain using the appropriate genetics symbols and diagrams, how it is possible for the couple to have a child with blood group O. (5 marks)

(ii) What is the probability or chance of their first child being a blood group B? (1 mark)

SECTION B:

Answer two questions from this section

Q6. (a) What do you understand by the following terms

(i) Eutrophication (2 marks)

(ii) Food web (2 marks)

(iii) Commensalism (2 marks)

(b) State eight (8) effects of bush burning on the environment (8 marks)

(c.) In a tabular form, distinguish between the food chain and food web (6 marks)

Q7. (a) What is sewage? (2 marks)

(b) State the qualities of a good pit latrine (6 marks)

(c.) List the advantages of a continuous water supply service (5 marks)

(d) What measures can be used in a community to control air pollution (7 marks)

Q8. (a) What are the qualities of a good hospital? (6 marks)

(b) State the benefits of the following to the community;

(i) Playgrounds (6 marks)

(ii) Religious organizations (4 marks)

(c.) How is prostitution harmful to society? (4 marks)

Q9. (a) Why do we preserve food? (5 marks)

(b) How is food preserved?

(i) Smoking (3 marks)

(ii) Pasteurization (2 marks)

(c.) How can food be contaminated at home? (4 marks)

(d) Name Three examples of food-borne diseases and their respective causative agents (3, 3 marks).

 

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