1.

1). Only A2). Only B3). Only C4). Both A & B

Answer»

Correct OPTION - 1

On looking at above mentioned passage, we OBSERVE that it is based on harmful effects of water pollution. It is discussed that construction of dams across rivers decreases the population of species that require running water i.e. flowing water which is available in rivers.

Thus, correct option is 1.

However, on the other hand, 2nd statement doesn't justify the question asked as it is nowhere mentioned in the passage that water pollution restricts the river system to a flowing ecosystem.

3rd statement doesn't clearly establish the relation between eutrophication and water pollution. Eutrophication is ACTUALLY caused by fertilisers USED on the crops to protect them from harmful organisms.



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