cameroon gce advanced level 2025 natural science 2

 

SECTION A

 

1. a) Make a labeled diagram to show the structure of the human heart. (10 marks)

b) Give THREE functions of blood. (3 marks)

c) Write short notes on the three (3) main blood vessels. (12 marks)

TOTAL (25MARKS)

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2. a) Define the following concepts in food science;

i) Food poisoning, (3 marks)

ii) Food Fortification, (6 marks)

iii) Food security. (3 marks)

b) List three (3) types of contaminants that cause food poisoning. (5 marks)

c) Enumerate five (5) reasons for the increase of cases of food poisoning in our society. (4 marks)

d) State four (4) methods of food preservation. (7 marks)

e) Give seven (7) importance of food preservation. (4 marks)

TOTAL (25 MARKS)

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3. a) Define conservation of water and state three (3) ways to save water. (4 marks)

b) Write short notes on the following;

i) Water (4 marks)

ii) Water supply (5 marks)

iii) Portable water (3 marks)

iv) Hard water

v) Soft water

c) Cite four (4) uses of water in the home. (2 marks)

d) i) Discuss the different sources of water used in our communities today, give examples. (4 marks)

ii) State the characteristics of portable water. (2 marks)

e) i) Name six (6) illness caused by drinking dirty or contaminated water. (3 marks)

ii) State and explain two (2) ways by which water can be purify. (5 marks)

TOTAL (25 MARKS)

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4. a) The terms Secretion, Defecation and Excretion is used erroneously.

i) Define the following;

Excretion (2 marks)

Secretion (1 mark)

Defecation (1 mark)

b) Give the various excretory organs and their excretory products in human. (8 marks)

c) Describe what happen when you drink a lot of water and produce much urine. (5 marks)

d) Describe what happen when you drink less water and produce. (5 marks)

e) i) Name two kidney diseases. (2 marks)

ii) Give the function of Anti-diuretic hormone. (1 mark)

TOTAL (25 MARKS)