Ans. In human life, biological rhythms maintain the whole body to work properly.  The biological clock manages the timing of every individual’s behaviour like a sleep-wakeup cycle, eating, activity, cognition, mood..etc. Biological rhythms also manage the individual’s cell functions, physiology control like metabolism, blood pressure, body temperature, DNA repair, cell cycle, etc.  The biological clock circadian rhythm controls a part of the brain through the suprachiasmatic nucleus, which is a group of cells in the hypothalamus, that respond to light and dark signals.