Question

Which of the following hormone is also called as antigibberellic hormone?

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

Answer 1

The correct option is A Abscisic acid

Abscisic acid is called as antigibberellic hormone. It is a plant growth inhibitor. Abscisic acid acts as antagonistic to the gibberellins by following ways.

Gibberellin	Abscisic acid
It promotes growth in the stem and leaves.	It inhibits plant growth.
It breaks the dormancy of seeds and buds.	It induces dormancy in seeds and buds.
It delays leaf senescence.	It promotes leaf senescence.

Auxin is a plant growth promoter that induces in apical dominance. Apical dominance is a phenomenon in which the main central stem of the plant grows more in length as compared to the other stems.
Cytokinin is a plant growth promoter that promotes cytokinesis that is the division of the cytoplasm of a parent cell into 2 daughter cells.
IAA stands for Indole-3-acetic acid. They are the most common naturally occurring auxins. They are produced in the growing apices of stem and root.