Question

Which of the following is not associated with growth of plant?

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

Answer 1

The correct option is D

Abscisic acid

The correct option is D.

Explanation of correct option:

1. The chemical compounds found in very low amounts in plants are known as plant hormones.
2. They are the derivatives of terpenes (gibberellins), indole (auxins), carotenoids (abscisic acid), adenine (cytokinins), and gases (ethylene).
3. These hormones monitor all the development and growth activities in plants like enlargement, cell division, flowering, dormancy, seed formation, and abscission.
4. In plants, the stress hormone is abscisic acid (ABA), which functions as a growth inhibitor and monitors dormancy and abscission.
5. It instigates the closing of stomata and favors the development and maturation of seeds.
6. Abscisic acid is not associated with the growth of a plant.

Explanation of incorrect options:

Option A:

1. Auxins are plant hormones, which play an essential role in the growth of plants.
2. It is produced at the tip of the plant and takes part in apical dominance.
3. It is also involved in tropisms that are responses to stimuli in the surroundings.

Option B:

1. Gibberellins are the plant hormones, which make the plant grow.
2. The gibberellins are added to the gardens to enhance the growth of plants.
3. It also stops the dormancy of seeds and buds and signals a seed to germinate.

Option C:

1. Cytokinins are the plant hormones, which make the cells divide, that is, help the plant to grow.
2. It prevents senescence, that is, the process of aging.

Final answer: Abscisic acid is not associated with the growth of a plant.