Question

Force responsible for the ascent of sap is :

• A. Capillary force
• B. Root pressure
• C. Transpirational pull
• D. All the three

Answer 1

The correct option is D

All the three

The correct option is D:

Explanation for Correct answer:

1. When the water reaches the xylem, a combination of osmosis and root pressure moves the water and minerals up through the xylem.
2. This upward movement of water is known as the ascent of sap.
3. The sap is the fluid that moves through the plant, consisting of water with dissolved minerals and sugars.
4. Since the xylem vessels are narrow, the water ascends to some extent through capillary action.
5. This movement of water occurs due to attraction between the water molecules (cohesion) and attraction of the water molecules to the walls of the xylem tracheids and vessels (adhesion).

So, the Force responsible for the ascent of sap is the Capillary force, Root pressure, Transpirational pull.