Question

Which of the following is not that least convincing in the imbibitional theory of ascent of sap ?

• A. The imbibitional force is very high from 100 - 1000 atm.
• B. The imbibitional force can raise the water to a height of 200' - 400' i.e. the tallest tree.
• C. The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels.
• D. The movement of water, no doubt is slow, but to some extent can keep pace with transpiration.

Answer 1

The correct option is C The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels.

In the imbibition theory, we can easily consider that ascent of sap in plants occur through xylem vessels and along the walls. In plants for the ascent of sap xylem tissue is present which is divided into four elements. Out of four xylem vessels plays an important role in the conduction via adhesion or imbibition or transpiration-pull.

So the correct answer is 'The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels'.