Question

Which of the following is an anti-transpirant?

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

Answer 1

The correct option is C

Abscisic acid

The correct option is C.

Explanation for the correct option:

1. Transpiration needs to be reduced in situation of stress like lack of water, high temperature, drought, etc.
2. There are certain plant hormones called stress hormones which help the plant to respond during the time of stress.
3. Abscisic acid is the stress hormone which reduces the rate of transpiration by stopping the potassium ion exchange process.
4. Thus, abscisic acid is anti-transpirant.

Explanation for incorrect options:

Option A:

1. Auxin is growth hormone and responsible for plant growth and development.
2. It is not a stress hormone.

Option B:

1. Gibberellin is a growth hormone and responsible for stem elongation and germination.
2. It is not a stress hormone.

Option D:

1. Cytokinin is also a growth hormone and responsible for cell division and cell expansion.
2. It is not a stress hormone.

Final answer: Abscisic acid is an anti-transpirant.