Question

_________are the site of perception for photoperiodic stimulation

• A. Roots
• B. Stem
• C. Shoot apices
• D. Leaves

Answer 1

The correct option is D Leaves

Photoperiodic stimulation or photoperiodism is defined as the response by an organism to the lengths of day and night. Leaves are considered to be the site of perception for photoperiodic stimulation. Now, it has been observed that a lot of plants need periodic exposure to light to induce flowering. It is the shoot apices of plants that modify themselves to flowering apices just before flowering. But these shoot apices do not perceive photoperiod by themselves . It is believed that a hormone is responsible for inducing flowering in plants, which is transported from the leaves to the shoot apices once the plant is exposed to adequate inductive photoperiod.