Question

Which one of the following growth regulators is known as stress hormone?

• A. Abscisic acid
• B. Ethylene
• C. $G{A}_3$
• D. Indole acetic acid

Answer 1

The correct option is A

Abscisic acid

Abscisic acid is called stress hormones as it induces various responses in plants against stress conditions. It induces the closure of the stomata during water stress. It promotes seed dormancy and ensures seed germination during favorable conditions.

Ethylene helps in fruit ripening.

$G{A}_3$ is chiefly responsible for stem elongation.

Indole acetic acid plays a key role in both root and shoot development.