1.

Study the given food web. Which of the following would lead to decrease in the water snail population?P. lncrease in Hydritla population Q. lncrease in tadpole population R. Decrease in kingfisher population S. lncrease in dragonfly nymphs population(A) Q only (B) P and R only (C) Q, R and S only (D) S only

Answer»

Correct option  (C) Q, R and S only 

Explanation:

According to the given food web, fish feed on young tadpoles and also on water snails. So, if there is increase in the population of tadpoles, the population of fish will increase leading to decrease in the population of water snails. Kingfishers feed on fish and fish feed on water snails. So, if there is decrease in the kingflsher population, there will be increase in fish population leading to decrease in the population of water snails. As the dragonfly nymphs feed on water snails, thus, increase in their population will lead to decrease in water snail population.



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