AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(D) Abscisic acid
Abscisic acid inhibits growth, promotes seed dormancy, and causes stomatal closure during water stress conditions in plants.
Abscisic acid (ABA) is often called the "stress hormone" of plants. Examiners expect you to remember that it acts opposite to growth-promoting hormones (auxin, gibberellin, cytokinin). The three key functions — growth inhibition, seed dormancy, and stomatal closure — are the standard points tested in MCQs on plant hormones.