Animal Behavior's and Plant Responses

Physical factors of the environment e.g. light, humidity

Factors in the environment due to other living things e.g. parasitism, competition

the sum total of an organisms requirements and its inter-relationship with other organisms in the community

a rhythm with a period of 24 hours

a rhythm with a period of approximately 24 hours under constant environmental conditions

a rhythm with a period of approximately 29 days under constant environmental conditions

a rhythm with a period of approximately 1 year under constant environmental conditions

a rhythm that is controlled by an external environment stimulus (zeitgeber) detected by an organism

a rhythm that is controlled by an internal biological clock

the time it takes to complete one cycle of activity

when the onset of the period of the rhythm is changed (either earlier or later)

when the onset of a free running rhythm occurs earlier than when the rhythm is entrained

when the onset of a free running rhythm occurs later than when the rhythm is entrained

the period of the rhythm when the clock is running without any cues from the environment

the resetting of the clock on a regular basis, forcing it to take up the period of the environment

Time keeper

active during the day and inactive during the night

active during the night and inactive during the day

active at dawn and dusk

no regular pattern of activity

the response of an organism to the change in a day or night length

plants that flower when the photoperiod exceeds a certain critical day length

plants that flower when the photoperiod is less than the critical day length

the induction of flowering or seed germination by a period of chilling