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The gaseous plant growth regulator is used in plants to :
promote root growth and roothair formation to increase the absorption surface
help overcome apical dominance
kill dicotyledonous weeds in the fields
speed up the malting process
Answers (1)
The gaseous plant growth regulator i.e. ethylene promotes root growth and root hair formation to increase the absorption surface.
The presence of cytokinin in an area causes preferential movement of nutrients towards it. When applied to lateral buds, they helps in their growth despite the presence of apical bud .they thus act antagonistically to auxin which promotes apical dominance. Therefore cytokines can overcome apical dominance, caused by auxins.
The compound 2,4-dichloro phenoxy acetic acid or 2, 4-D is a herbicide used-lo kill any dicot plant weed. The substance is a synthetic auxin, which is a phytohormone.
Gibberellins are used to speed up the malting process in brewing in dust. They increase the yield of malt from barley grains.
Hence, the correct option is (1).
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