Question

Which of the following hormone is antitranspirant?

• A. Auxin
• B. Abscisic acid
• C. Cytokinin
• D. Ethylene

Hint:

Abscisic acid also plays a significant role in seed dormancy and in the regulation of plant responses to environmental stress, such as drought.

Answer 1

The Correct Option is B

Abscisic acid (ABA) is a plant hormone known as an antitranspirant because it helps reduce water loss by closing stomata. It plays a key role in maintaining water balance and is important for plant drought tolerance. During periods of water stress, ABA levels increase, leading to the closure of stomata and thus minimizing transpiration. Thus, the correct answer is Abscisic acid.