Biology · May / June 2019 · Paper 11 · Question 32

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?

1. Aholding silt in the reservoir so that it is not spread on the flood plain
2. Bproviding a reservoir of still water for mosquito larvae
3. Cseparating migrating fish from spawning grounds
4. Dstoring water for humans to drink

As printed in the paper