Chapter 176 of 2363 min read
Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA
Why this is asked: Auxin's apical dominance is a genuine paradox worth remembering: the same hormone that drives elongation at the shoot apex simultaneously suppresses the lateral buds below it, so it's removing the apex — not adding more auxin — that finally lets the laterals grow.
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- •Which one of the following phytohormones promotes nutrient mobilisation, which helps in the delay of leaf senescence in plants?
- •Read the following statements on plant growth and development. (A) Parthenocarpy can be induced by auxins. (B) Plant growth regulators can be involved in the promotion as well as the inhibition of growth. (C) Dedifferentiation is a pre-requisite for redifferentiation. (D) Abscisic acid is a plant growth promoter. (E) Apical dominance promotes the growth of lateral buds. Choose the option with all correct statements:
- •Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass, as auxin:
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