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diurnal - of or belonging to or active during the day; diurnal animals are active during the day; diurnal flowers are open during the day and closed at night; diurnal and nocturnal offices. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
The rhythms follow a roughly 24-hour cycle linked to the patterns of light and dark in the environment around the organism. Humans are no exception, with processes and behaviours such as sleep, cell division, and alertness following this 24-hour cycle.nimals and plants have rhythms that match these cycles. A simple example of this is activity linked to day and night. Kiwi are active at night; behaviour that is described as nocturnal. PÅ«keko are active during the day; behaviour that is described as diurnal.