| A | B |
|---|
| day-neutral plant | a plant whose flowering is not affected by the length of daylight |
| deciduous tree | one of a group of trees that lose all their leaves about the same time each year |
| hormone | a chemical made in an organism that has an effect on another part of that organism |
| long-day plant | a plant that flowers only when the length of daylight is longer than a certain time |
| negative tropism | behavior in which the response is growth away from a stimulus |
| response | a reaction of an organism to an environmental change |
| pigment | a colored substance found in plants |
| positive tropism | behavior in which response is growth toward a stimulus |
| short-day plant | a plant that flowers only when the length of daylight is shorter than a certain time |
| stimulus | a change in the environment that causes a response |
| tendril | a plant structure that wraps around objects the plant touches |
| tropism | a behavior caused by growth of a palnt toward or away from a stimulus |
