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Which is most widely used hormone in agriculture and why?


Ethylene is one of the most widely used PGR in agriculture. Since ethylene regulates many physiological processes like flowering, fruit ripening, initiating germination, synchronisinng fruit-set, rapid intenode/petiole elongation, breaking seed/bud dormancy etc. it is used in agriculture.
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 How 2, 4-D helps in preparing weed- free lawns ?

2, 4-D  kills the dicotyledonous weeds but does not affect the mature monocotyledonous plants. Thus, it is used to prepare weed-free lawns by gardeners.
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Give one antagonistic effect of cytokinin and gibberellin. 

The antagonistic effect of cytokinin and auxin is on the apical dominance. the cytokinins help to overcome apical dominace whereas the auxin induce it. 
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What is chemical name of kinetin ? 

The chemical name for kinetin is N6-furfurylamino purine. 
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Which hormone is sprayed on sugarcane for increasing yield ?

Spraying gibberellins on the sugarcane crop increases the length of the stem, which in turn increases the yield. 
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