Question

Identify the growth hormone in plants which causes inhibitory effect.

• A. Cytokinins
• B. Abscisic acid
• C. Gibberellin
• D. Ethylene

Hint:

Remember the main roles of plant hormones: Auxins (growth), Gibberellins (stem elongation, germination), Cytokinins (cell division), Ethylene (ripening), and Abscisic acid (inhibition, stress response).

Answer 1

The Correct Option is B

Abscisic acid (ABA) is a plant hormone that functions in many plant developmental processes, including bud dormancy. It is also known as the "stress hormone" because it is involved in the response to environmental stresses like drought. A primary function of ABA is to inhibit growth, acting as an antagonist to growth-promoting hormones like auxins and gibberellins. It promotes stomatal closure, inhibits shoot growth, and induces seed dormancy.