Question

In tall trees, water is absorbed due to
A. Transpiration/suction pull
B. Root pressure
C. Capillary action
D. Photosynthesis

Answer 1

Hint: Generally, the roots in plants absorb water from the soil with the help of the root pressure gradient. This water is then evaporated by the stomata present on the leaves by the process of transpiration. But sometimes water can also be evaporated through certain openings or pores present on the older stems known as lenticels.

Complete step by step answer: The transpiration pull is a biological process in which a force of pull or a suction pull is generated inside the xylem tissue of the plant. This suction force assists in the movement of water in the upward direction inside the xylem vessels. Due to this movement, the loss of water in the form of vapours through the leaves takes place. This method is observed in all higher plants and trees, especially taller trees. The method of transpiration pull is also known as suction force. It draws the water upward from the roots towards leaves. The water received by the leaves is used for the photosynthesis and the remaining water is released into the surroundings in the form of vapours. This occurs through the small pores in the leaves called stomata and through certain openings or pores present on the older stems known as lenticels.
So, the correct answer is option A.

Additional information: The transpiration pull theory is also referred to as the cohesion-tension theory. It was given by Dixon and Joly in 1894 and was further supported by Renner, Curtis and Clark. This theory is mainly based on the two features, namely, cohesion and adhesion and transpiration pull

Note: Transpiration is the process of loss of water from the leaves (or lenticels) of the plant in the form of water vapour. The water is absorbed by roots from the soil and is transported as a liquid through the stem to the leaves by the xylem tissue.