Question

In plants, the transpiration pull theory for ascent of sap was first proposed by

• A. Dixon.
• B. Dixon and Jolly.
• C. J.C. Bose.
• D. Strasburter.

Answer 1

The correct option is B Dixon and Jolly.

Cohesion transpiration pull theory was put forward by Dixon and Jolly in 1894. It is also known as Dixon's theory of ascent of sap. Loss of water from the aerial parts in transpiration causes a suction pressure in the water column of the plants which leads to the ascent of sap. It is known as transpiration pull.

Thus, the correct answer is option B.