What is the site of perception of photoperiod necessary for induction of flowering in plants?

Concept:
Photoperiod is a period for which plants are exposed to sunlight.
Based on photoperiods, plants are classified as short-day plants, day-neutral plants, and long-day plants.
Short-day plants require a shorter duration of light and long-day plants require a long duration of sunlight.
Day-neutral plants are independent of the duration of sunlight.
✅Explanation:
The site of perception of light in plants during photoperiodism is the leaf.
The developmental responses of the plants to the relative lengths of the light and the dark periods are called photoperiodism.
During the process of flowering, the photoperiodic stimulus is grasped by the leaves of the plants, and due to this, a floral hormone, florigen is produced in the leaves.
This hormone is translocated to the apical tip, subsequently causing the initiation of floral primordial.