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8.5
Term | Definition |
---|---|
tropism | a plants growth and response |
hormone | a chemical that affects the plants growth and develop |
auxin | an important plant horomone |
photoperiodism | seasonal changes in length of night and day |
short-day plant | theses plants flower when nights are longer |
long-day plant | theses plants flower when nights are shorter |
critical night length | number of hours of darkness |
day-neutral plant | this flowering cycle is not as sensitive |
dormancy | a period where of a plants growth stops |
annual | yearly |
biennial | two year cycle |
perennial | more than two years |