Fishes are added to eat the larve in the pond.
The correct options are
∙ Mosquitoes lay their eggs in still water bodies.
∙ Baby mosquitoes which come out of the eggs are called larvae. They stay in water bodies until they are grown-ups.
∙ To decrease the population of mosquitoes these larvae should be killed.
∙ One way of killing them is by adding fishes into these water bodies.
∙ These fishes eat up the larvae. Hence, they help in decreasing the population of mosquitoes.