Question

The main function of abscisic acid in plants is to

• A. Increase the length of cells
• B. Promote cell division
• C. Inhibit growth
• D. Promote growth of stem

Answer 1

The correct option is C

Inhibit growth

The correct option is C.

Explanation of the correct option:

• Abscisic acid is a hormone that suppresses the growth of a plant.
• It counters the activity of growth hormones when they promote excessive growth.
• It is also known as the stress hormone as it closes the stomata to prevent excess transpiration, causes the seed to become dormant, and promotes the wilting of leaves during harsh environments.

Explanation of the incorrect options:

Option A:

• The action of gibberellin increases the length of the cells in plants.

Option B:

• The cell division in plants is caused by the action of cytokinin.

Option D:

• The growth of the plant stem is promoted by auxin.

Final answer: Therefore, the primary function of abscisic acid is to inhibit plant growth.