Question

Which hormone maintains dormancy of seeds until favourable conditions?

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

Hint:

ABA (Abscisic acid) = Dormancy hormone. Gibberellin = Germination hormone.

Answer 1

The Correct Option is D

Step 1: Understand seed dormancy.
Seed dormancy is a condition in which seeds do not germinate even under favourable conditions. It is an important mechanism that helps plants survive adverse environmental conditions.
Step 2: Identify the hormone responsible.
Abscisic acid (ABA) is known as a growth-inhibiting hormone. It plays a major role in inducing and maintaining seed dormancy by inhibiting germination.
Step 3: Analyze other hormones.

• (A) Auxin: Promotes cell elongation and growth.
• (B) Gibberellin: Promotes seed germination and growth.
• (C) Ethylene: Involved in fruit ripening.
• (D) Abscisic acid: Correct. It inhibits growth and maintains dormancy.

Step 4: Conclusion.
Therefore, the hormone responsible for maintaining seed dormancy is abscisic acid.
Final Answer:} Abscisic acid.