Plant Growth Regulators Functions — NEET Biology
📚 Practice ConceptWhich one of the plant growth regulators would you use if you are asked to: (a) induce rooting in a twig (b) quickly ripen a fruit (c) delay leaf senescence (d) induce growth in axillary buds (e) 'bolt' a rosette plant (f) induce immediate stomatal closure in leaves.
Consider the following statements regarding plant growth regulators (PGRs): 1. Gibberellins can delay senescence in fruits (like apples) and also induce bolting in rosette plants such as cabbage. 2. Auxins such as 2,4-D are widely used to kill monocot weeds in lawns while sparing dicot plants. 3. Cytokinins help overcome apical dominance and promote chloroplast formation in leaves. 4. Ethylene promotes root hair formation and induces flowering in pineapples and mango. 5. Abscisic acid (ABA) stimulates stomatal closure, helps seeds withstand desiccation, and acts antagonistically to gibberellins. Which of the above statements are correct ?
View solution & NCERT explanation
Correct answer: B — 1, 3, 4, 5
Statement 1 – Correct: GA delays senescence in apples and promotes bolting in rosette plants. Statement 2 – Incorrect: 2,4-D kills dicot weeds, not monocots. Statement 3 – Correct: Cytokinins overcome apical dominance and promote chloroplast formation. Statement 4 – Correct: Ethylene promotes root hair formation and induces flowering in pineapple and mango. Statement 5 – Correct: ABA closes stomata, induces dormancy, and is antagonistic to GA.
What does NCERT say about Which one plant growth?
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.