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(B) The physiological response of plants to the relative lengths of light and dark periods is called $Photoperiodism$. $Phototropism$ refers to the gr

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Photoperiodism

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(B) The physiological response of plants to the relative lengths of light and dark periods is called $Photoperiodism$. $Phototropism$ refers to the growth of a plant in response to a light direction. $Phototaxis$ is the movement of an organism in response to light. $Vernalization$ is the induction of a plant's flowering process by exposure to the prolonged cold of winter. Therefore,the correct answer is $Photoperiodism$.

The physiological response of organisms to the duration of light and darkness is known as:

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