How is humus important for plants?

Important Questions on Natural Resources

EASY

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 4

Why is soil considered an important natural resource? Give two reasons.

EASY

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 5

Explain how an excessive use of nitrate fertilisers in agricultural fields may affect human life.

MEDIUM

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 6

Define soil erosion. State its two major causes. How can we prevent it ? 

EASY

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 1

What are the various factors which cause weathering of rocks? Explain in detail.

MEDIUM

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 2

What is soil profile? Describe the different horizons of soil with the help of labelled diagram.

MEDIUM

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 3

What is meant by soil pollution? What are its various sources? Also, state its harmful effects and method of control.

EASY

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 1

What is the biogeochemical cycle?

EASY

9th CBSE

IMPORTANT

Biology for Class IX>Chapter 6 - Natural Resources>Exercise>Q 2

What do you mean by nitrogen fixation?