Question

write short note on biological clocks

Answer 1

A twenty-four-hour cycle of body activity, which operates in some organisms, is called the circadian rhythm. Note: Although the term biological clock refers to all innate timing mechanisms, it is often used when describing certain body functions that are subject to this rhythm, such as the loss of fertility with age.

Answer 2

many animals that are active during the day come out just before the sun rises. Plants can anticipate the sunrise, orientating their leaves towards the horizon before the sun actually rises. Likewise, plants that exhibit sleep movements tend to ‘wake up’ (raise their leaves) a little before sunrise. These organisms must have some internal awareness of time. This is often referred to as a ‘Biological Clock’

A biological clock is an internal (endogenous) timing system that continues without any external cues and controls the activities of plants and animals