Question

1. Contour ploughing helps in soil conservation.
2. Ploughing along the contour lines helps reduce the speed of surface runoff.

Options

• (B) contradicts (A).

• (B) is the reason for (A).

• (A) is true but (B) is false

• (A) and (B) are independent of each other.

Answer 1

(B) is the reason for (A).

Explanation:

Ploughing following a slope’s natural contour lines results in horizontal ridges and furrows that serve as small dams. These ridges break the momentum of rainfall moving downhill, lowering the velocity of surface runoff. Slowing down the water prevents the soil from washing away, which immediately benefits soil conservation. As a result, statement (B) explains the exact physical mechanism and reason why statement (A) is correct.