QABiology › The appearance of fireflies at dusk is an example of a circadian rhythm because it:
Q

The appearance of fireflies at dusk is an example of a circadian rhythm because it:

A. is related to the phase of the moon

B. is related to the temperature of the air

C. happens daily

D. happens seasonally

A

Answer: C. happens daily

Circadian rhythms are processes that occur in a 24-hour cycle. A good example of a circadian rhythm is the appearance of fireflies at dusk because it happens daily, at a specific time. The time frame between the appearances of fireflies in two days is roughly 24-hours. Another good example of a circadian rhythm is the sleep-wake cycle in man. There is a designated time every day to sleep and this goes on consistently. Also, the opening and closing of petals of flowers is a form of the circadian rhythm.

10 months ago
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