(a) Plants do not have any nervous system but yet if we touch a sensitive plant, some observable ...

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(a) Plants do not have any nervous system but yet if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated.
(b) Name the hormone that needs to be administered to
(i) increase the height of a dwarf plant.
(ii) cause rapid cell division in fruits and seeds.

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