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.