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Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
2,4-D kills broadleaved (dicotyledonous) weeds but does not affect mature monocotyledonous plants (such as lawn grasses and cereal crops)!
Synthetic auxins such as 2,4-D (2,4-dichlorophenoxyacetic acid) are widely applied in agriculture and horticulture.
NCERT explicitly notes: "2,4-D is widely used to kill dicotyledonous weeds, it does not affect mature monocotyledonous plants. It is used to prepare weed-free lawns by gardeners."
Lawns consist of grasses which are monocotyledonous plants. Because mature monocots are physiologically insensitive to the concentrations used to kill dicots, 2,4-D eliminates weeds without harming the lawn.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
2,4-D selectively eradicates broadleaved dicot weeds without harming mature monocot grasses.
If it damaged monocots, it would destroy the grass lawn.
2,4-D is a chlorinated phenoxy organic compound.
2,4-D is a synthetic auxin; IAA and IBA are natural auxins.
Thinking 2,4-D is naturally extracted from plants.
"2,4-D is widely used to kill dicotyledonous weeds, it does not affect mature monocotyledonous plants. It is used to prepare weed-free lawns by gardeners."
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