Question

Dinesh applied DDT, a pesticide in his garden to control termites. He could control termites successfully during the initial stages, but subsequent usage of the same did not produce any results. Evaluate the survival of termites on the basis of Natural Selection.

Answer 1

According to The Theory of natural selection, the organisms are in competition for limited resources (struggle for existence).

Only organisms with favourable variations survive. And this leads to the evolution of new species with favourable variations. They become accustomed to the new environment.

This new species produce more number of offsprings (overproduction).

Here the pests have variations to overcome the DDT. Organisms with favourable variations survive and lead to the evolution of new species which can survive DDT.