CBSE Class 9 Biology Natural Resources Water and Soil

Q.

What is the percentage of water which covers the Earth's surface?



Q.

What processes occur between substances which are dissolved in water?



Q.

Which of the following is not a source of water pollution?



Q.

How is water used in power plants?



Water

Explain the source and requirement of water & soil by plants and animals. Cause and effect of water and soil pollution.