Chapter 9

2. Plant vascular tissue that carries water and minerals from the roots to the leaves
3. The response of a plant to the pull of gravity
8. Plant response to a stimulus
10. A type of phloem cell. A tube
11. Extensions of epidermal cells that protrude from the outer layer of a plant root to provide additional surface area for absorbing water and dissolved minerals from the soil
13. A combination of organs and tissues that perform a shared complex function
15. A combination of various types of tissue that work together to perform a specific function
16. A type of phloem cell. A cell
19. Lens-shaped openings perforating the bark of woody plants such as trees, allowing gas exchange between the environment and the living cells below the bark

1. Plant vascular tissue that carries sugars produced by the leaves to various parts of the plant
4. A plant growth hormone produced in plant tips
5. The process by which plants use light energy to produce food in the form of carbohydrates
6. The tendency of water molecules to stick to other water molecules
7. Water pressure within plant cells that allow them to remain rigid
9. A cluster of similar cells that share the same structure and functions
12. The tendency of water molecules to certain surfaces
14. A small opening the epidermal layer of a leaf that allows gases in and out
17. A sugar that is used by cells as a source of energy
18. Environmental factors that induce a response from an organism
20. A waxy substance coating the epidermis of plants, which prevents the evaporation of plants