Explain the process of rooftop rainwater harvesting with the help of a suitable diagram.

_____ water becomes breeding site for larvae of mosquitoes.

What is water harvesting? How is rainwater harvested in your home?

Why should the tap not be left running while brushing or shaving? 

State four ways by which we can save water.  

Give one measure to conserve water.

When is world water day celebrated? (March $22$/February $22$)

Give reasons.

Water is a very important constituent of our diet.