Plant Growth Regulators & Their Functions — NEET Biology
📚 Practice ConceptList five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
Match the following plant growth regulators with their primary physiological effects or agricultural applications: Column I (Physiological Effect/Application) A. Hastens fruit ripening in tomatoes and apples B. Promotes bolting in beet and cabbages C. Induces parthenocarpy in tomatoes D. Helps overcome apical dominance E. Increases tolerance to various kinds of stresses Column II (Plant Growth Regulator) 1. Auxin 2. Gibberellin 3. Cytokinin 4. Ethylene 5. Abscisic acid (ABA)
View solution & NCERT explanation
Correct answer: D — A–4, B–2, C–1, D–3, E–5
The question asks to match plant growth regulators with their specific physiological effects or agricultural applications as described in NCERT. A. Hastens fruit ripening in tomatoes and apples is a function of Ethylene. Ethephon, a source of ethylene, hastens fruit ripening in tomatoes and apples. (Matches with 4. Ethylene) B. Promotes bolting (internode elongation just prior to flowering) in beet, cabbages, and many plants with rosette habit is a function of Gibberellin. (Matches with 2. Gibberellin) C. Induces parthenocarpy, for example, in tomatoes, is an application of Auxins. (Matches with 1. Auxin) D. Cytokinins help overcome apical dominance by promoting lateral shoot growth. (Matches with 3. Cytokinin) E. Abscisic acid (ABA) increases the tolerance of plants to various kinds of stresses, hence it is called the stress hormone. (Matches with 5. Abscisic acid) Therefore, the correct matching is A–4, B–2, C–1, D–3, E–5. Option D provides the correct matches for all the given physiological effects and applications with their respective plant growth regulators.
What does NCERT say about List five main groups?
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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.