Question

____________ helps to overcome apical dominance.

• A. IAA
• B. Gibberellin
• C. Cytokinin
• D. Ethylene

Answer 1

The correct option is C Cytokinin

Cytokinin is a plant growth promoter that helps to overcome apical dominance. Apical dominance is a phenomenon in which the growth of the main central stem of the plant is more as compared to the other stems. They act as antagonists to auxins.
They help to regulate axillary bud growth. When auxin is used they inhibit the axillary bud growth and restrict lateral branching. But cytokinin helps in the growth of axillary bud and a plant becomes bushy.

IAA stands for Indole-3-acetic acid. They are the most common naturally occurring auxins. Auxins are plant growth promoters. They are produced in the growing apices of stem and root. They help in promoting apical dominance.

Gibberellin is a plant growth promoter that helps in the elongation of genetically dwarf plants. Genetically dwarf plants are those plants which are significantly smaller in size as compared to other plants of the same species.
Ethylene is a plant growth promoter as well as a plant growth inhibitor. It helps in the ripening of fruits.