Question

Opposition to the construction of large dams is due to
(a) Social reasons
(b) Economic reasons
(c) Environmental reasons
(d) All of the above

Answer 1

Hint: Dams are the reservoir which suppresses the floods and restricts the flow of water. They provide water for various purposes which include industrial use and human consumption.

Complete answer:
Opposition to the construction of large dams is due to social reasons, economic reasons and environmental reasons as the large dams are built at the highest cost which results in the decrement of the economy and the submergence of large areas of natural forests. The displacement of a large number of indigenous people takes place on building a dam which is built in a hilly area that gives rise to sudden earthquakes and landslides. The construction of dams require hydropower for the generation of electricity by dams and can be used to collect water and storage water which can be evenly distributed in different locations. They prevent water flow in specific land regions.
The construction of dams is responsible for destroying the ecosystem balance and the relationship between the water and land which took thousands of years to create. It creates soil erosion of land which holds back the sediment load normally that is found in a river flow and lowers the riverbed which threatens vegetation and river wildlife. The construction of dams in tropical areas allowed the breeding of mosquitoes and other vectors which carry malaria due to their slow movement and cause Schistosomiasis and river blindness.

So, the correct answer is 'All of the above’.

Note:
Around the world, 50,000 rivers are clogged by large dams and are changing the face of the Earth. $16\%$ of the world's electricity is generated by dams and about 80 million people get displaced due to the construction of dams.