O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2018 · Q321 Mark

Why are insecticides sometimes regarded as pollutants?

AThey can increase the number of bacteria in ponds and rivers.

BThey can increase the rate of growth of water plants.

CThey can kill a wide range of insects.

DThey can kill the plants that they are designed to protect.

✓ Correct answer

C: They can kill a wide range of insects.

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 32.

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