Question

Assertion :Air temperature decreases from the equator towards the poles. Reason: As one move from the sea level to higher altitudes, the atmosphere becomes less dense and temperature decreases.

• A. Both A and R are true and R explains. A.
• B. Both A and R are true but R does not explain A.
• C. A is true and R is false.
• D. A is false and R is true.

Answer 1

The correct option is B Both A and R are true but R does not explain A.

• The temperature of the air decreases with the migration from the equator towards the poles. This change is due to the difference in atmospheric pressure.
• When there is an increase in the altitudes, there are fewer air molecules which result in a decrease in the atmospheric pressure. This decrease in the pressure results in a drop in the temperature.
• When one moves from the sea level to the higher altitudes, there is a change in the temperature due to the decrease in the pressure.
• Both the assertion and reason are correct but the reason does not explain the assertion.
• Thus, the correct answer is option B.