Answer in brief: Protected forests are also not completely safe for wild animals.Why ?

Answer in brief: Why should we conserve biodiversity?

Explain why ecological succession will be faster in a forest devastated by fire then on a bare rock? Also compare succession in case of an abandoned land after floods with that on a bare rock?

In certain simple plants, why are male gametes produced in large numbers as compared to the female gametes? It is applicable in animals also? Yes or not.

The tropical rain forest has a large population of animals. Explain why is it so.

Answer the following : Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet's velocity in general. Yet the work done by the gravitational force over every complete orbit of the comet is zero. Why?

(a) Cite the evidence on the basis of which it is concluded that birds have evolved from reptiles. (b) Insects, Octopus, Planaria and Vertebrates also possess eyes. Can these animals be grouped together on the basis of the eyes they possess. Why or why not? Give reason to justify your answer.