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BotanyNEET 2024Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA

Plant Growth and Development

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass, as auxin:

  1. A.promotes abscission of mature leaves only.
  2. B.does not affect mature monocotyledonous plants.✓
  3. C.can help in cell division in grasses, to produce growth.
  4. D.promotes apical dominance.

Solution

2,4-D and other synthetic auxins kill dicot weeds but leave mature monocots such as grasses unaffected, which is why they are used to keep lawns weed-free.

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