Abscisic Acid: Stress Hormone Role — NEET Biology
🔥 Predicted for NEET 2027As mentioned earlier, abscisic acid (ABA) was discovered for its role in regulating abscission and dormancy. But like other PGRs, it also has other wide ranging effects on plant growth and development. It acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA increases the tolerance of drought and cold in plants and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone. ABA plays an important
Adjacent to a frequently-asked paragraph in the same chapter.
Assertion (A): ABA acts as a stress hormone during drought by closing stomata. Reason (R): This is an example of extrinsic factor regulation of development
View solution & NCERT explanation
Correct answer: C — A is true, but R is false
ABA is intrinsic (produced inside plant) and closes stomata under stress. It is not an extrinsic factor.
What does NCERT say about As mentioned earlier abscisic?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.