The kind of economic and social development we want will ultimately determine whether the environment will be conserved or further destroyed.

Name the group of bacteria whose presence confirms the contamination of river water.

Suggest suitable mechanism$(s)$ for waste management in fertiliser industries.

According to the $2010$ report,how many total National Parks are there in India?

The ozone molecule absorbs ultraviolet $(UV)$ radiation of which wavelength range?

$(i)$ What is the height of the ozone layer from the equator?
$(ii)$ Name the rays against which the ozone layer provides protection.
$(iii)$ Name one effect of the depletion of the ozone layer.