The Pigment Most Involved with Photoperiodism is ____

Question

The pigment most involved with photoperiodism is ____.  
A) chlorophyll
B) xanthophyll
C) anthocyanin
D) phytochrome
E) phycoerythrin

Accepted Answer

Phytochrome is the pigment most involved with photoperiodism, as it is a protein complex that can exist in two interconvertible forms (Pr and Pfr) and acts as a photoreceptor that senses red and far-red light. It plays a key role in regulating various plant responses to changes in day length and seasonal transitions. Chlorophyll, xanthophyll, anthocyanin, and phycoerythrin are pigments involved in photosynthesis, light harvesting, and photoprotection but not directly related to photoperiodism.