Which of the following terms describes plant activities that follow a biological clock so that they are based on cycles of about 24 hours?

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Circadian rhythms describe plant activities that are based on cycles of about 24 hours, such as the opening and closing of flowers and the movement of leaves. Gravitropisms and thigmotropisms refer to responses to gravity and touch, respectively. Photoperiodisms refer to plant responses to changes in day length.

Which of the Following Terms Describes Plant Activities That Follow