The living organisms on or around the earth constitute

Which solvent from the following is used in order to avoid the creation of waste and the pollution of air?

Which among the following has the highest concentration of $PAN$?

Some gases are responsible for the heating of the atmosphere (greenhouse effect). Identify from the following the gaseous species which does not cause it.

Dinitrogen is a robust compound,but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is

Give two names of herbicides.