Question

The gaseous plant growth regulator is used in plants to:

• A. help overcome apical dominance
• B. speed up the malting process
• C. promote root growth and root hair formation to increase the absorption surface
• D. kill dicotyledonous weeds in the fields

Answer 1

The correct option is C promote root growth and root hair formation to increase the absorption surface

Gaseous plant growth regulator is ethylene which helps in root growth and root hair absorption and therefore increases the surface area for absorption.

Ethylene promotes water absorption by increasing the root's absorption surface. It inhibits shoot elongation and promotes the elongation of the root hairs and the root itself and it is also responsible for increasing the cell permeability in some cases. It has also been observed to increase the osmotic pressure and the concentration of cell sap.

So, the correct answer is "option D"