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2015-04-30T22:10:28+05:30

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The substance  which act at minute concentration and  cordinate the growth  process of the plants  termed  as plant  growth substance.

ex :  auxine  ,    cytokinis.................

hope its  help u.....
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2015-05-01T09:51:06+05:30
Which are low in concentration but essential for plant process called growth . eg- auxin 
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