| Plant
Responses and Growth |
Vocabulary |
---------------------------------------------------------------------------------------------- |
| Tropism |
The
turning or bending movement of an organism or a part toward or away from
an external stimulus, such as light, heat, or gravity. |
| Hormone |
A
chemical messenger that carries a signal from one cell to another. |
| Auxin |
A
class of plant growth substance that play an essential role in
coordination of many growth and behavioral processes in the plant life
cycle.
|
| Photoperiodism |
The
physiological reaction of organisms to the length of
night or day.
|
| Short-Day Plant |
A
plant that cannot flower under the long days of summer. |
| Long-Day
Plant |
A
plant that requires less than a certain # of hours of
sunlight in each 24 hour period to
induce flowering.
|
| Day-Neutral
Plant |
Does
not require a specific day length to flower. |
| Dormancy |
A
period in an organisms life cycle
when growth, development, and physical activity.
|
| Critical
Night Length |
The
length of darkness that must be exceeded by short-day plants for flowering
to be initiated. |
| Annual |
Used
to describe something that happens once a year. |
| Biennial |
An
event that occurs every two years.
|
| Perennial |
A
plant that lives longer than
two growing seasons. |
