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

We often observe domestic waste decomposing in the bylanes of our homes. List four ways to make the residents aware that the improper disposal of wastes is harmful to the environment and also for their own health.

State one important function of ozone layer in the atmosphere. How is it formed there? Which compounds are responsible for the depletion of ozone layer? How do these compounds enter into the atmosphere?

Which of the following is $NOT$ an effect of deforestation?

Write the harmful effects of using plastic bags on the environment. Suggest alternatives to plastic bags.

The most important compound which accounts for almost $80\%$ of the total depletion of the ozone layer is $.........$