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Definition of Term

photoperiod
(english) Light phase of a light-dark cycle, which changes seasonally and latitudinally. Many animals and plants are sensitive to the length of day and night, and their biochemical activities respond to it. (See also: diurnal)
photopériode
(french) Phase éclairée d'un cycle jour-nuit. Beaucoup d'animaux et de végétaux sont sensibles à la durée du jour et de la nuit, et leur activité biochimique en dépend. (See also: diurnal)
fotoperíodo
(portuguese) Fase luminosa dum ciclo luz/escuridão. Muitos animais e plantas são sensíveis à duração dos dias e das noites e a sua fisiologia responde a essas variações. (See also: diurnal)

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