Q.

The site of perception of light/dark duration are:

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a

Leaves

b

Shoot apices

c

Root apices

d

Buds

answer is A.

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Detailed Solution

The site of perception of light/dark duration are the leaves. It has been hypothesised that there is a hormonal substance(s) that is responsible for flowering. This hormonal substance migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.
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The site of perception of light/dark duration are: