Question

Which plant hormone is called antitranspirant?

• A. Gibberellins
• B. Auxin
• C. Ethylene
• D. ABA

Hint:

ABA = Stress hormone Closes stomata $\rightarrow$ Reduces transpiration

Answer 1

The Correct Option is D

Concept: Abscisic acid (ABA) is a plant hormone involved in stress responses.
• It causes closure of stomata.
• Reduces water loss through transpiration.

Step 1: Understand transpiration control.
Transpiration occurs through stomata.

Step 2: Role of ABA.
ABA induces stomatal closure, reducing water loss.

Step 3: Analyze options.
• (A) Gibberellins: Growth hormone
• (B) Auxin: Cell elongation
• (C) Ethylene: Fruit ripening
• (D) ABA: Anti-transpirant (correct)

Step 4: Conclusion.
Thus, ABA is called antitranspirant. Final Answer: Option (D)