Question

The photoperiod in plants is perceived at ____________.

• A. meristem
• B. flower
• C. floral buds
• D. leaves.

Answer 1

Answer: (D)

leaves.

It has been experimentally demonstrated that photoperiodic stimulus is perceived by leaves.This conclusion is based on the following observations -
(i) A plant from which all the leaves have been removed fails to flower even after getting the required inductive cycles.
(ii) In Xanthium (a short day plant) flowering occurred if one-eighth of a leaf was exposed to short days.