NEET Biology Plant Growth And Development Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Answer: (b)

Abscissic acid (ABA), also known as abscisin II and dormin, is usually found in vascular plants, some fungi and some green algae. It is a multipurpose plant hormone which acts as an inhibitor because it opposes the growth of promoting effect of auxins, GA and cytokinins, thus keep their activity under control. ABA is also known as stress hormone because it is produced under conditions of stress and causes partial closure of stomata under drought and thus acts as anti-transpirant.