Topic: Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA· Plant Physiology

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

1. can help in cell division in grasses, to produce growth.

2. promotes apical dominance.

3. promotes abscission of mature leaves only.

4. does not affect mature monocotyledonous plants.

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Answer: 4. does not affect mature monocotyledonous plants.

Key idea: synthetic auxins like 2,4-D kill dicot weeds but not monocot crops or grass.

Mature monocotyledonous plants (grasses) do not respond to 2,4-D at those concentrations, while broad-leaved dicot weeds do. So the lawn is safe and the weeds die. Auxins do promote apical dominance, but this does not explain why grass is unharmed.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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