A Cycle of Biological Activity That Repeats Around Every 24

Question

A cycle of biological activity that repeats around every 24 hours.  
A) Circadian rhythm
B) Photosynthesis
C) Respiration
D) Glycolysis
E) Photorespiration

Accepted Answer

Circadian rhythm refers to a biological cycle that repeats around every 24 hours, such as the sleep-wake cycle or the release of certain hormones. The other options (B to E) do not necessarily follow a 24-hour cycle. Photosynthesis and respiration, for example, can occur continuously as long as the necessary resources are available. Glycolysis and photorespiration are specific metabolic pathways that do not directly relate to a daily cycle.