_______ is an Indian tree planting festival which is celebrated for a week in the month of July. 

What percentage of the earth's surface is covered by forest? 

Who is called the Bird man of India?

Plants use solar energy and convert it into ______.

________ ecosystem is placed between  terrestrial ecosystem and marine ecosystem.

Human beings are ________.

_________ is known as the 'lungs of the planet'.

______ is a product that we get from forest.

The ultimate source of energy on earth is _______.

Burning of fossil fuels release ________ to the air.