Question

mention 2 environmental problems caused by building of dams

Answer 1

constructing cost is high
large area of agricultural land and human habitation should be sacrificed
social problems (ncert pg:275)

Answer 2

▪Impact on aquatic life=> Fish in reservoir of the dam do not get sufficient nutrien material.Also they cannot migrate beyond the dam for spawning.
▪Change of cropping pattern=>Farmers have changed the crop pattern in many regions by shifting to water intensive and commercial farming due to increased availability of water from these projects.