Question

Assertion (A): Carbon dioxide and water vapours are found only in the lower layers of atmosphere.

Reason (R): Carbon dioxide and water vapour are meteorologically important gases.

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, and R is the correct reason for A.

Explanation:

Carbon dioxide and water vapour are found mainly in the lower layers of the atmosphere (up to about 90 km for CO₂). These gases are meteorologically important because they play key roles in weather and climate. Water vapour is crucial for cloud formation and precipitation, and both gases absorb heat, contributing to the greenhouse effect that warms the lower atmosphere. Hence, their presence in the lower atmosphere is directly related to their meteorological importance.