Question

survival of a man is a stake if you don't conserve our rich fauna justify

Answer 1

It is true that survival of man is at stake if we do not conserve our rich fauna, because animals play a major role in our life. They provide us milk and milk products. Also, during drought season, they help us in cultivating and ploughing the fields. The fish is nutritive too and provides us rich proteins.
Besides, many insects help in pollination of crops and fruit trees. So, every species has a role to play in the ecosystem. Hence, we have to take some effective measures to conserve these resourceful species.