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The Flowers of Plants Pollinated by Night-Flying Bats Open,secrete Nectar,and

Question 50

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The flowers of plants pollinated by night-flying bats open,secrete nectar,and release fragrance only at night.The mechanism that controls this is called ____.  


A) thigmotropism
B) heliotropism
C) phototropism
D) photoperiodism
E) circadian rhythm

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