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Solution


Q.

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin                   [2024]
1 promotes apical dominance  
2 promotes abscission of mature leaves only  
3 does not affect mature monocotyledonous plants  
4 can help in cell division in grasses, to produce growth.  

Ans.

(3)

Auxins are widely used as herbicides by the gardeners to prepare weed-free lawns. 2, 4-D, a synthetic auxin is widely used to kill dicotyledonous weeds but it does not affect mature monocotyledonous plants.