Circannual rhythms
A) require information on changing day length.
B) are more important for birds that are year-round temperate residents than for birds that live at the equator and migrate to temperate areas to breed.
C) have shorter periods than circadian rhythms.
D) continue when animals are held under constant laboratory conditions.
E) can be disabled by lesioning the suprachiasmatic nuclei (SCN).

Question

Quizplus · Accepted Answer

Circannual rhythms, unlike circadian rhythms, are biological processes that occur on a yearly cycle. These rhythms can persist even in constant laboratory conditions, indicating they are internally generated and do not rely on external cues like changing day length or temperature to maintain their cycle.

Circannual Rhythms