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The site of perception of light in plants during photoperiodism is:
The site of perception of light/dark duration in photoperiodism is the leaves! The hypothetical floral hormone (florigen) synthesized in leaves migrates via phloem to the shoot apex to induce flowering. Match Option (4)!
Plant photoperiodic floral transition separates perception site from response site:
Photoreceptors (primarily phytochromes) localized within leaf mesophyll cells measure the critical duration of darkness and photoperiod. Upon receiving an inductive photoperiod, leaves synthesize a translocatable chemical messenger (florigen) that travels through the phloem to the shoot vegetative apex.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
The shoot apex is the site of response (where vegetative meristem converts to floral meristem), not the site of light perception.
The stem acts as a conduit for vascular translocation, not the primary sensory receptor tissue for photoperiodism.
Axillary buds may differentiate into flowers under hormonal induction, but do not perceive the light stimulus.
Leaves are the canonical site of perception of light/dark duration during photoperiodism.
Nearly 40% of candidates fall for "Shoot apex" because flowers appear at the apex. However, shoot apices are blind to photoperiod; leaves perceive light and signal the apex.
"The site of perception of light/dark duration are the leaves. It has been hypothesized that there is a hormonal substance responsible for flowering."
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