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Photoperiod is the duration of light received
daily by living organisms.
seasonally by living organisms.
daily and seasonally by non living organisms.
daily and seasonally by living organisms.
Explanation:
Living organisms receive light by light receptors (e.g. eye, photoreceptors, stigma, ocellus, etc.) Thus, light is used as a stimulus for activity cycles. The duration of light received daily and seasonally is called photoperiod. For example, when the duration of daylight reduces, animals go into hibernation.
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