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 the growth of stem

Answer 1

The correct option is C

Inhibit growth

The correct option is option C.

Explanations for the correct option:

1. Abscisic acid is a key plant hormone that mediates the plant's responses to abiotic stress.
2. It is also known as the stress hormone as it enables the plants to tolerate stressful conditions.
3. It stimulates the closing of stomatal pores and allows the seeds to mature.
4. It also inhibits plant metabolism and germination of seeds and regulates dormancy.

Explanations for the incorrect options:

Option A:

1. Auxin is responsible for promoting cell elongation and is produced in the stem tips.
2. It promotes lateral and adventitious growth of shoots and stimulates chlorophyll formation.

Option B:

1. Cytokinin promotes cell division and controls the developmental processes of plants.
2. It reduces sugar accumulation during senescence and increases chlorophyll synthesis to prolong photosynthesis.

Option D:

1. Auxin is produced in the stem buds and root tips and is responsible for stem elongation.
2. It promotes lateral and adventitious growth of shoots and stimulates chlorophyll formation.

Final answer: The main function of abscisic acid in plants is to inhibit growth.