A term used to refer to the natural physiological processes that regulate the timing of various biological functions.

जैविक घड़ी

English Usage: The concept of a biological clock explains why some animals migrate at specific times of the year.

Hindi Usage: जैविक घड़ी का सिद्धांत बताता है कि कुछ जानवर साल के कुछ विशेष समय पर प्रवास क्यों करते हैं.