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Subject :NSO    Class : Class 6

Refer to the given graph.

What can be the possible reason for the change in the population of mosquito larvae in the pond?
(i) There is a layer of oil over pond.
(ii) New fish are introduced into the pond.
(iii) There is a period of dry weather.
(iv) Many of the mosquito larvae have changed into mosquitoes.

A(i) and (iii)
B(ii) and (iv)
C(i), (ii) and (iii)
D(i), (ii), (iii) and (iv)

answer is c

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