Which one of the following generally act as an antagonists to gibberellins?
(a) Zeatin (b) Ethylene
(c) ABA (d) IAA
Abscisic Acid (ABA) is also called stress hormone. It is mildly acidic growth hormone which functions
as a general growth inhibitor by counteracting other hormones (auxin, gibberellin, cytokinin) or reactions mediated by them. It causes stomatal closure, abscission of flower and fruits while gibberellin helps in opening of stomata and promote development of fruits.