O-LevelBiologyEcology & Environment5090/11 · May/June 2019 · Q321 Mark

Many of the world's major rivers have dams to control the flow of water. Which consequence of this is of long-term benefit to humans?

Aholding silt in the reservoir so that it is not spread on the flood plain

Bproviding a reservoir of still water for mosquito larvae

Cseparating migrating fish from spawning grounds

Dstoring water for humans to drink

✓ Correct answer

D: storing water for humans to drink

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2019 Paper 1 Variant 1, question 32.

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