Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA
Top questions
See all →- Read the following statements on plant growth and development.A. Parthenocarpy can be induced by auxins.B. Plant growth regulators can be involved in promotion as well as inhibition of growth.C. Dedifferentiation is a pre-requisite for re-differentia… Answer: 1. A, B, C only Key idea: Check each statement. A true: auxins can induce parthenocarpy. B true: PGRs may promote or inhibit growth.... 1
- Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants? Answer: 4. Cytokinin Key idea: Cytokinins delay leaf senescence by promoting nutrient mobilisation. Ethylene and abscisic acid promote senes... 1
- Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield? Answer: 3. Gibberellin Key idea: gibberellins cause stem elongation. Spraying sugarcane with gibberellin increases internode length, so more... 1
- Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin Answer: 4. does not affect mature monocotyledonous plants. Key idea: synthetic auxins like 2,4-D kill dicot weeds but not monocot crops or g... 1
- Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production? Answer: 3. Gibberellic Acid Key idea: Spraying gibberellic acid (GA) on juvenile conifers hastens maturity, so they produce seeds early. ABA... 1
- Which hormone promotes internode/petiole elongation in deep water rice? Answer: 4. Ethylene Key idea: In deep water rice, submergence raises ethylene levels, and ethylene promotes rapid elongation of internodes a... 1