photoperiod
pl: photoperiods
Related Words
lightdarknesscyclecircadianrhythmseasonsolardiurnalnocturnalcrepuscularbiologybotanyzoologyphysiologyhormonemelatoninphytochromecryptochromechlorophyllphotosynthesisfloweringbloomdormancyhibernationestivationmigrationbreedingreproductiongrowthdevelopmentphenologyequinoxsolsticelatitudehemisphereorbitrotationaxisdurationintervalperiodicityoscillationclockentrainmentzeitgeberphototropismphototaxisphotoperiodismspectrumwavelengthphotonradiationirradianceluxintensityexposurethresholdadaptationevolutionecologyenvironmentclimateweatherspringsummerautumnwinter