Plant Growth and DevelopmentMedium
Question
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
Options
A.does not affect mature monocotyledonous plants.
B.can help in cell division in grasses, to produce growth.
C.promotes apical dominance.
D.promotes abscission of mature leaves only.
Solution
Sol. [Key Concept: Selective auxin herbicides]
Synthetic auxin herbicides such as 2,4-D kill many broadleaved dicot weeds while mature grasses are relatively tolerant at the recommended application rate. This selectivity is the basis of option (1). It does not mean that auxin has no normal physiological effects on monocots.
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