Question

Which of the following is not involved in the cohesion tension theory of water movement in plants

Answer 1

Answer:

According to the most widely accepted theory of Dixon and Jolly for the ascent of sap, is the ascent of sap in plants is a passive physical process, which occurs under the influence of transpiration pull generated due to loss of water from aerial parts. Other than the pull, a continuous column of water is also essential for the rise of water in xylem elements. The continuous column of water is maintained by cohesion forces between water molecules and adhesive forces between water molecules and vascular elements of the plant.

So, the correct answer is option B

Answer 2

Refer to this full question-

Which of the following is not involved in the cohesion tension theory of water movement in plants.

A) presence of hydrogen holding water

B) transpiration

C) diffusion of water from cells in the root to the cells in the shoot.

Answer:

The correct option is A) Presence of hydrogen holding water is not involved in the cohesion tension theory of water movement in plants.

Explaination:

The cohesion theory

• The cohesion tension theory explains how water is transported through the xylem vessels from the roots to the shoots of the plant.
• According to this theory, transpiration from the leaves creates a negative pressure (tension) that pulls water from the soil into the roots and then up through the xylem vessels to the rest of the plant.
• The cohesion of water molecules also plays a role in this process, as the hydrogen bonding between water molecules allows them to stick together and be pulled up through the xylem vessels as a cohesive column.

From above points it is clear that option B) and C) are not involved in the cohesion theory so, these options are incorrect.

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