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Question:

Which one of the following generally act as an antagonists to gibberellins?

ABA

Zeatin

Ethylene

IAA

Solution:

Abscisic acid (ABA) is a growth retardation hormone which inhibits seed germination and seedling growth. Treatment of dormant seeds with gibberellins partly overcome the effects of ABA and stimulates seed germination. So, the correct answer is ABA.