Question

Transpiration - cohesion tension theory operates through

• A. Active absorption
• B. Passive absorption
• C. Active and Passive absorption
• D. Apoplastic movements

Answer 1

The correct option is B Passive absorption

(A) Active absorption is the absorption process when it is being driven by the force present in the root which occurs through osmosis or use of active transport to move molecules of solutes to change the water concentration gradient.

(B) The force for passive absorption originates in the aerial part of the plant due to loss of water in transpiration which causes upward motion and cohesion theory is a theory of intermolecular attraction that explains the process of upward flow of water through the xylem.

(D) Apoplastic movement is the movement of water through the apoplast between loosely packed cortical cell which occurs in the root.

So, the answer is, "Passive absorption".