GK
ECOLOGY BIODIVERSITY CONSERVATION ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Both (A) and (R) are true, with (R) being the correct explanation.
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Both (A) and (R) are true, but (R) is not the correct explanation.
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(A) is true, but (R) is wrong.
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Both (A) and (R) are wrong.
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Detailed explanation-1: -The greatest impacts result from the impoundment of water, flooding of land to form the dam, and alteration of water flow downstream. It affects the ecosystem as a whole. The assertion is true.
Detailed explanation-2: -Due to decreased water discharges, water temperature will rise in daytime and decline sharply at night. Rooted plants will grow in the riverbed due to the decrease in water volume. Fish such as snow trout, catfish and loaches may be pulled into the intakes and get killed.
Detailed explanation-3: -Large dams have led to the extinction of many fish and other aquatic species, the disappearance of birds in floodplains, huge losses of forest, wetland and farmland, erosion of coastal deltas, and many other unmitigable impacts.