Question

plzz give answer fastly

Answer 1

Ans. The reasons for multi-purpose projects and large dams coming under great scrutiny and opposition are (i) Local communities have been displaced from their original setdement areas, with consequent loss of livelihood and income.
(ii) These projects create conflicts between people
wanting to avail benefits from the same water
resources. This leads to unsetded disputes.
(iii) Objections have been raised about sedimentation of the reservoirs leading to floods in nearby areas, causing land degradation by deprivation of silt (a natural fertilizer) to the land, and other consequent problems associated with such projects.

                                HOPE THIS IS USEFUL TO U

Answer 2

hey parvathy~!
:)
1.Regulating and damming of rivers affect their natural flow causing poor sediment flow and excessive sedimentation at the bottom of thereservoir, resulting in rockier stream beds and poorer habitats for the rivers’ aquatic life.
2.Dams also fragment rivers making it difficult for aquatic fauna to migrate, especially for spawning.
3.The reservoirs that are created on the floodplains also submerge the existing vegetation and soil leading to  its decomposition over a period of time.
4.Multi-purpose projects and large dams have also been the cause of many new social movements like the ‘Narmada Bachao Andolan’ and the ‘Tehri Dam Andolan’ etc. Resistance to these projects has primarily been due to thelarge-scale displacement of local communities.
5.Local people often had to give up their land,livelihood and their meagre access and control over resources for the greater good of the nation. 
hope it helps u dear!:)