Unit 3 Vocabulary

2. a thing or event that causes a response or reaction
5. system above-ground part of a plant that includes the organs such as leaves, buds, stems, flowers (if the plant has any), and fruits (if the plant has any)
6. stimulus a change in the environment outside of the organism
7. turning of all or part of an organism in a particular direction in response to an external stimulus
10. balanced; unchanging
12. process of water moving through plants and evaporating from the leaves and stems into the atmosphere
15. system belowground part of a plant that includes the organs such as roots, tubers, and rhizomes
16. mechanism a response within a system that influences the activity of that system
17. growth that happens in organisms in response to gravity, such as the downward growth of plant roots

1. the body’s ability to keep the internal balance of the body stable
3. pressure exerted by water inside the cell on the cell wall
4. stimulus a change within the organism
8. growth that happens in organisms in response to light, such as a stem bending toward a light source
9. a change in the position of an object
11. a push or pull that can change the position or motion of an object / material
13. conducting tissue in plants that transports nutrients through the plant
14. vascular tissue in plants that transports fluid through the plant