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Question

The site of perception of light in plants during photoperiodism is :

A
Leaf
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B
Shoot apex
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C
Stem
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D
Axillary bud
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Solution

The correct option is A Leaf
Flowering in certain plants depends on a combination of light and dark exposures and also their relative durations (photoperiods). This response of plants to periods of day/night is termed photoperiodism.

The shoot apices modify themselves into flowering apices prior to flowering. The shoot apices by themselves cannot percieve photoperiods. The site of perception of light/dark duration are the leaves. It has been hypothesised that a hormonal substance(s) that is responsible for flowering migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.

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