Rhythms Flashcards
Many plants and animals are controlled by rhythms.
1
Q
What is photoperiodicity?
A
It is the change in response to changing daylength
2
Q
What is a circadian rhythm?
A
It is a response or behaviour that changes on a cycle of 24 hours
3
Q
Why is it better to germinate in the spring?
A
The conditions for growth are better (e.g. warmth, light)
4
Q
Give 2 other examples of photoperiodism
A
Growth: none over winter and some trees lose their leaves
Reproduction: some produce flowers in response to longer days (summer + spring). Some flower when daylength is short like in autumn
5
Q
What is the circadian rhythm controlled by?
A
An internal biological clock. Day and night help to match the clock to changes in the environment
