Question

Assertion (A): Lack of nitrogen can cause serious damage to crops.

Reason (R): Earth’s atmosphere contains 78% nitrogen.

Options

• Both A and R are true and R is the correct reason for A.

• Both A and R are true but R is not the correct reason for A.

• A is true and R is false.

• A is false and R is true.

Answer 1

Both A and R are true but R is not the correct reason for A.

Explanation:

Lack of nitrogen harms crops because nitrogen is essential for plant growth. Although the Earth’s atmosphere contains 78% nitrogen, plants cannot use this nitrogen directly. Nitrogen must be fixed in the soil for plants to absorb it, so the high atmospheric nitrogen is not the direct reason for its importance to crops.