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Auxins initiate as well as promote cell ...

Auxins initiate as well as promote cell division in tissues like cambium. Auxins stimulate cell elongation also. Auxin is thought to cause the walls to become plastic and due to endosmosis cell elongates.
Answer the following:
(a) Why auxins are being used as weedicide?
(b) How auxins are helpful in production of parthenocarpic fruits?

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