Question

Exudation of xylem sap at the cut ends of the stem is due to pressure.

• A. Root
• B. Leaf
• C. Stem
• D. Gland

Hint:

Root pressure is responsible for driving water through the xylem, especially in the early morning when transpiration is low.

Answer 1

The Correct Option is A

Step 1: Exudation of xylem sap at the cut ends of the stem, commonly observed in plants, occurs due to root pressure. Root pressure is generated when water is absorbed by the roots and pushed upwards through the xylem, causing the sap to be exuded through cut surfaces.

Step 2:
- (B) Leaf is involved in transpiration, not in the exudation of xylem sap at cut ends.
- (C) Stem is where xylem sap is transported, but it is the root pressure that causes sap exudation at the cut ends.
- (D) Gland does not play a role in sap exudation from the xylem.

Conclusion: Root pressure is responsible for exudation of xylem sap, making \( (A) \) the correct answer.