(C) Photoperiodism is the physiological reaction of organisms to the length of day or night. It is defined as the developmental response of plants to

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Effect of day length on plant growth and development

(C) Photoperiodism is the physiological reaction of organisms to the length of day or night. It is defined as the developmental response of plants to the relative lengths of light and dark periods. This phenomenon is crucial for the initiation of flowering in many plant species.