Question

What are several growth/development responses that are mediated by photoperiodism?

Answer 1

Photoperiodism is the plants response to the duration of light exposed by it.
Photoperiodism regulates many developmental processes in plants.
Some mosses and liverworts show similar responses to light.
Photoperiodism changes the chromophore forms.
In red light Pr is converted to Pfr and in far red light, Pfr is converted to Pr.
Presence of Pr inhibits germination and pfr induces germination.
In some plants flowering is also regulated by photoperiodism.
Some seeds buried deep inside soil when exposed to red light germinates.