Question

give reason large dams destroy ecosystem

Answer 1

yes,large dams destroy ecosystem.
to build a dam the area under it is completely destroyed all the peoples living there are shifted to somewhere else the tress are removed and the animals lose their shelter.
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Answer 2

Yes it is true ,because large dam is create on the rivers for the production of electricity but there are some disadvantages of this, they are

1 the back water due to storage of water in Dam May submerge villages or town in this area this lead to the problem of rehabilitation of displaced population moreover this can also submerge forest as well as a fertile land

2. The obstruction of the flow of river water may have adverse effect on living world in the river

3. Hence Dam can destroy the ecosystem