Question

Assertion (A): Root pressure does not play a major role in water movement in tall trees.
Reason (R): Root pressure is responsible for pushing up water to small heights in stem.

• A. A and R are correct. R is the correct explanation of A.
• B. A and R are correct. R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.

Hint:

Root pressure helps in pushing water up in plants, but for tall trees, transpiration pull is the main mechanism responsible for water movement.

Answer 1

The Correct Option is B

Analysis of Assertion and Reason

Assertion (A): "Root pressure does not play a major role in water movement in tall trees." ✅ This statement is correct. Root pressure is important in smaller plants and under certain conditions (such as at night), but in tall trees, transpiration pull is the dominant mechanism for water transport.

Reason (R): "Root pressure is responsible for pushing up water to small heights in the stem." ✅ This statement is also correct. Root pressure helps in pushing water upwards but is only effective for short distances. In tall trees, its role is minimal compared to transpiration pull.

🔹 However, the reason (R) does not fully explain the assertion (A). While root pressure plays a minor role in water movement at shorter heights, it is not the primary driver in tall trees.

Thus, the correct answer is: (2) A and R are correct, but R is not the correct explanation of A.