Plants & Cycles

2. the process by which carbon atoms move between the Earth and its atmosphere
6. the process by which plants use gravity to direct their growth, causing roots to grow down and shoots to grow up
7. a powdery substance produced by the male part of a flower (anther) that contains the male gametes (sperm) necessary for fertilization
8. pores on the surface of plants that allow for gas exchange and water regulation
11. cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems
12. a specialized tissue system that transports water, nutrients, and other substances throughout the plant
13. the part of a plant that grows above ground and includes the stem, leaves, buds, flowers, and fruits
14. the turning or bending of a plant or other organism in response to a touch stimulus
16. also known as phytohormones, are responsible for plant growth, defense, and productivity
18. plants that bear flowers and fruits
19. Pollen is carried from the anther of one flower to the stigma of another flower, enabling fertilization and seed production

1. the ability of an ecosystem to maintain its structure and function, or to return to its equilibrium state after a disturbance
3. a change in the environment that causes a living organism to respond in some way
4. the process of fusion of the female gamete (ovum or egg) with the male gamete (sperm)
5. carries water and minerals from the roots to the leaves
7. the ability of plants to grow in a specific direction in response to light
9. transports sugars from the leaves to other parts of the plant
10. the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers
15. the turning of all or part of an organism in a particular direction in response to an external stimulus
17. outgrowths of epidermal cells, specialized cells at the tip of a plant root, used for absorption of water and minerals