[Campbell Biology P.1190] What is a key distinguishing characteristic between circadian rhyth... | Practice Question
What is a key distinguishing characteristic between circadian rhythms and circannual rhythms, as explained in the provided text?
A: Circadian rhythms are primarily synchronized by the lunar cycle, whereas circannual rhythms are regulated by daily light-dark cycles.
B: Circadian rhythms govern daily cycles of rest and activity, while circannual rhythms involve longer, yearly cycles such as migration and reproduction.
C: Circannual rhythms are direct responses to changes in food availability, whereas circadian rhythms are only influenced by temperature.
D: Both circadian and circannual rhythms cannot maintain rhythmic activity under constant environmental conditions.
Explanation
The text explains that the circadian clock governs a 'daily cycle of rest and activity' 24-hour periodicity , while circannual rhythms are 'linked to the yearly cycle of seasons' and include behaviors like 'migration and reproduction.' This highlights their differing time scales.