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Rhythms template



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QuestionsAnswers
Biological clockan internal timing mechanism
Rhythm periodthe length of a cycle of activity when under constant environmental conditions
Circadiana rhythm with a period of approximately 24 hours
Circatidala rhythm with a period of approximately 12.5 hours
CircalunarA rhythm with a period of approximately 29.5 days
CircannualA rhythm with a period of approximately 365 days
Daily/Yearly patternBehaviors we see daily and yearly that are linked to changes in the environment
Free runningdescribes when the biological clock have no environmental cues
Entrainmentthe process by which the biological is kept in check with the environment; it is entrained by a zeitgeber
Phase shiftwhen the start of the activity cycle has changed time
ZeitgeberGerman for "time giver"; this resets a biological clock and keeps the activity entrained to changes in the environment
Endogenousinternally controlled
Exogenousexternally controlled
Phytochromea pigment that is involved in flowering
Environmental cueA cue that gives an organism information on the time, resetting the biological clock
SDP (short-day plant)a plant that is initiated to flower when nights are longer than a critical length
LDP (long-day plant)a plant that is initiated to flower when nights are shorter than a critical length



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