The photoperiod in plants is perceived at

Answer

D

Explanation

Fully developed leaves receive the stimulus of light photoperiodism is the effect opflight and its duration on the growth and development especially flowereing in plants Even a single leaf as its part is part is capable of flowering in palnts .Even a single leaf as its part is apart is capable of inducing photoperidism but very yound leaves are insensitive to light. Other parts meristem flower and flowra buds denot perceive the stimulus .