Name the term which defines the ability of the plants to measure the length of photoperiods?

Name the term which defines the ability of the plants to measure the l

1.	Name the term which defines the ability of the plants to measure the length of photoperiods?
A.	Phototropin
B.	Photoperiodism
C.	Cryptochrome
D.	Gravitropism
Answer» C. Cryptochrome