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Question 3

(Multiple Choice)

Refer to the figure.
Refer to the figure. In these figures, each horizontal line represents 1 day, and each vertical line represents a half-hour on a 24-hour timescale. Dark marks indicate periods of cricket calling. The bars at the top and middle represent the lighting conditions. The top figure demonstrates that in a constant light (LL) environment, male crickets A) are unable to maintain a regular cycle of calling. B) call continuously throughout the day due to the constant light input. C) maintain a daily cycle of calling and noncalling that starts slightly later each day. D) reset their calling cycle to start a few hours before the lights go off and continue until a few hours before the lights go on. In these figures, each horizontal line represents 1 day, and each vertical line represents a half-hour on a 24-hour timescale. Dark marks indicate periods of cricket calling. The bars at the top and middle represent the lighting conditions. The top figure demonstrates that in a constant light (LL) environment, male crickets


A) are unable to maintain a regular cycle of calling.
B) call continuously throughout the day due to the constant light input.
C) maintain a daily cycle of calling and noncalling that starts slightly later each day.
D) reset their calling cycle to start a few hours before the lights go off and continue until a few hours before the lights go on.

Answer

C

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