NDA 2019 GAT · General Knowledge · Plant Physiology · hard

Which plant hormone helps the plant to cope with water stress by promoting closure of stomata?

Single correct option

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

Show answer and solution

Answer: (B) Abscisic acid

Abscisic acid acts as the stress hormone: under water shortage it makes the guard cells lose turgor, closing the stomata and cutting water loss. Auxin and gibberellin promote growth and cytokinin promotes cell division.

Report a mistake

← Previous Plant Physiology question Next Plant Physiology question →

Original question written in the NDA 2019 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake