Integrated Science

Question 1

1Which of the following is a vector of the disease river blindness (onchocerciasis)?

Medium

A. Anopheles mosquito B. blackfly (Simulium) C. housefly D. tsetse fly

Question 2

2Which practice improves soil fertility?

Easy

A. bush burning B. crop rotation C. continuous cropping without manure D. overgrazing

Question 3

3Which is an organic manure?

Easy

A. NPK fertiliser B. sulphate of ammonia C. urea D. compost

Question 4

4Proper disposal of refuse prevents the breeding of

Easy

A. flies and rats B. fish C. cattle D. birds

Question 5

5Eutrophication of water bodies is mainly caused by

Hard

A. cold weather B. planting trees C. run-off of fertilisers rich in nitrates and phosphates D. fish farming only

Question 6

6The build-up of gases such as carbon dioxide that trap heat in the atmosphere causes

Easy

A. the greenhouse effect and global warming B. the ozone layer to thicken C. earthquakes D. acid rain only

Question 7

7Biological control of pests uses

Medium

A. flooding B. chemical sprays C. natural enemies of the pest D. burning

Question 8

8Leaching of nutrients is most severe in

Hard

A. sandy soils in high-rainfall areas B. loams in deserts C. clay soils in dry areas D. soils under cover crops

Question 9

9Which is a sexually transmitted infection?

Easy

A. gonorrhoea B. cholera C. tuberculosis D. malaria

Question 10

10Which disease is caused by a protozoan transmitted by the tsetse fly?

Hard

A. yellow fever B. cholera C. malaria D. sleeping sickness