Long-night plants that only flower when they encounter a certain minimum number of hours of darkness are an example of:

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The type of plant described only flowers when it encounters a certain minimum number of hours of darkness, which is an example of photoperiodism. Geotropism is a plant's response to gravity, thigmotropism is a plant's response to touch, and phototropism is a plant's response to light.

Long-Night Plants That Only Flower When They Encounter a Certain