Question

Cell division is promoted by which plant hormone?

• A. Cytokinin
• B. Auxin
• C. Ethylene
• D. Gibberelin

Answer 1

The correct option is A

Cytokinin

The correct option is A.

Explanation of correct option:

1. Cytokinin are adenine derivatives.
2. They are a group of plant growth regulators which are primarily involved in performing cell division in plant roots, shoot system.
3. This hormone helps in promoting the cell’s growth, development, differentiation, affecting apical dominance and delay in leaf senescence.
4. Cytokinin help in increasing the cell division by maintaining the protein production that is important for mitosis.

Explanation of Incorrect options:

Option B:

1. Auxins are a group of naturally occurring and artificially synthesized plant hormones.
2. They play an important role in the regulation of plant growth.
3. Auxins are involved in the growth of plants, cell elongation, cell division and differentiation, secondary growth, root initiation on cuttings, apical dominance, induces parthenocarpy, fruit development, delays the senescence of flowers etc.

Option C:

1. Ethylene is a multi-functional hormone that is known to regulate both growth and senescence.
2. Ethylene stimulates the abscission of flowers, leaves, fruits and other parts of the plant. It helps in the formation of hydrolases.
3. It breaks the dormancy of seeds, buds and storage organs.
4. Ethylene induces flowering in plants like pineapple and mango.

Option D:

1. Gibberellins are any group of plant hormones that stimulate elongation of the stem, flowering and germination.
2. They are involved in regulating the growth and influencing different developmental processes which include stem elongation, germination, flowering, enzyme induction, etc.

Final answer: Cytokinin is the phytohormone that is involved in cell division.