Physiological Effects of Plant Growth Regulators — NEET Biology

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.