Question

Which hormone helps in rapid cell division and inhibition of apical dominance?

• A. Ethylene
• B. Cytokinins
• C. Auxins
• D. Abscisic acid (ABA)

Answer 1

The correct option is B

Cytokinins

The correct option is B

Explanation of the correct option-

1. Apical dominance is a phenomenon observed in plants where the growth of the central stem is dominant over lateral stems. This promotes the vertical growth of plants.
2. Cytokinins are growth-promoting hormones in plants that induces rapid cell division, growth of lateral buds, and inhibit apical dominance.

Explanation of the incorrect options-

Option A

1. Ethylene, a gaseous hormone, promotes the ripening of fruits. It inhibits longitudinal growth and promotes isodiametric or transverse growth in plants.

Option C

1. Auxin promotes cell growth in plants and thereby promotes cell expansion, division, and differentiation. It promotes apical dominance.

Option D

1. Abscisic acid is a well-known growth retarding hormone. It causes ageing of leaves, abscission, seed dormancy, etc.

Final Answer:
Cytokinins help in rapid cell division and inhibit apical dominance.