Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): High Na-concentration in irrigation water may reduce oxygen supply to the root system.
Reason (R): High sodium content in irrigation water causes flocculation of soil particles.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

Remember that sodium (\(\text{Na}^+\)) is a dispersing agent, whereas calcium (\(\text{Ca}^{2+}\)) and organic matter act as flocculating agents in soil. Dispersion ruins soil physical structure, leading to poor root aeration.

Answer 1

The Correct Option is C