Examination on Agricultural Science
Class: Primary 5
Term: Second Term
Time: 1 Hour
Total Marks: 70

SECTION A: OBJECTIVES (40 Marks)
Instruction: Answer all questions.

1. ________ are unwanted plants that grow where they are not needed. (a) Crops (b) Weeds (c) Flowers (d) Trees
2. Which of these is NOT a common insect pest identified in farms? (a) Beetle (b) Weevil (c) Earthworm (d) Grasshopper
3. The main reason farmers control weeds is because they ________. (a) make the farm look dirty (b) compete with crops for nutrients (c) attract useful insects (d) provide shade for crops
4. The use of living organisms to control weeds is called ________ control. (a) chemical (b) cultural (c) biological (d) physical
5. All of these are examples of insect pests except ________. (a) Locust (b) Caterpillar (c) Termite (d) Spider
6. Which of these is NOT a method of cultural weed control? (a) Mulching (b) Hand-pulling (c) Spraying herbicides (d) Timely planting
7. An example of a pest that destroys grains in storage is the ________. (a) grasshopper (b) weevil (c) caterpillar (d) locust
8. The correct step to take when using herbicides is to ________. (a) spray without protective gear (b) read the manufacturer’s instructions (c) spray only at night (d) use more than the recommended dosage
9. Plant diseases are defined as ________. (a) any plant growing where it is not wanted (b) organisms that harm crops (c) abnormal conditions that affect plant health (d) insects that eat plant leaves
10. Which of the following is a causal agent of plant diseases? (a) Weeds (b) Fungi (c) Scarecrow (d) Mulch
11. Weeds affect crop growth primarily by (a) providing shelter (b) reducing competition (c) sharing water and nutrients (d) increasing yield
12. Setting traps and scarecrows are methods used to control ________. (a) weeds (b) diseases (c) pests (d) soil erosion
13. The chemicals used to kill weeds are known as ________. (a) insecticides (b) fungicides (c) herbicides (d) pesticides
14. A common insect pest known for eating leaves and defoliating crops is the ________. (a) weevil (b) termite (c) caterpillar (d) beetle
15. Which of these is a way pests can cause damage to crops? (a) improving soil fertility (b) eating leaves and roots (c) increasing pollination (d) enhancing photosynthesis
16. A key precaution when using chemical control is to ________. (a) wear protective clothing (b) spray against the wind (c) mix different chemicals (d) eat while spraying
17. An example of biological weed control is ________. (a) burning weeds (b) using weed-eating insects (c) hand-pulling weeds (d) tilling the soil
18. Which of these describes cultural control methods for weeds? (a) using chemicals (b) managing the farm environment (c) introducing natural enemies (d) genetic modification of crops
19. To control plant diseases, farmers should plant ________. (a) any available seeds (b) healthy seeds or seedlings (c) seeds from diseased plants (d) only old seeds
20. Organisms that cause harm to crops and farm animals are called ________. (a) weeds (b) diseases (c) pests (d) parasites

SECTION B: THEORY (30 Marks)
Instruction: Answer any THREE questions.

1. (a) Define the term ‘weeds’. (2 marks)
(b) List three problems that weeds cause to farmers. (3 marks)
(c) Explain two ways weeds affect the growth and yield of crops. (3 marks)
(d) Give two examples of cultural methods of weed control. (2 marks)

2. (a) What are ‘pests’ in agriculture? (2 marks)
(b) Mention three common insect pests that attack crops. (3 marks)
(c) Describe two ways pests can cause damage to crops. (3 marks)
(d) State two methods farmers use to control pests. (2 marks)

3. (a) Define ‘plant diseases’. (2 marks)
(b) List three causal agents of plant diseases. (3 marks)
(c) Explain two ways farmers can control plant diseases. (3 marks)
(d) What are herbicides, and what are they used for? (2 marks)

4. (a) Explain what is meant by biological weed control. (2 marks)
(b) Give three examples of cultural weed control methods. (3 marks)
(c) State three precautions a farmer should take when using chemical control methods. (3 marks)
(d) Identify two problems associated with uncontrolled weeds on a farm. (2 marks)

Objective Marking Scheme

Question 1 – ✅ (b) Weeds
Question 2 – ✅ (c) Earthworm
Question 3 – ✅ (b) compete with crops for nutrients
Question 4 – ✅ (c) biological
Question 5 – ✅ (d) Spider
Question 6 – ✅ (c) Spraying herbicides
Question 7 – ✅ (b) weevil
Question 8 – ✅ (b) read the manufacturer’s instructions
Question 9 – ✅ (c) abnormal conditions that affect plant health
Question 10 – ✅ (b) Fungi
Question 11 – ✅ (c) sharing water and nutrients
Question 12 – ✅ (c) pests
Question 13 – ✅ (c) herbicides
Question 14 – ✅ (c) caterpillar
Question 15 – ✅ (b) eating leaves and roots
Question 16 – ✅ (a) wear protective clothing
Question 17 – ✅ (b) using weed-eating insects
Question 18 – ✅ (b) managing the farm environment
Question 19 – ✅ (b) healthy seeds or seedlings
Question 20 – ✅ (c) pests