B.12(A)

3. cell layer at the inner boundary of the cortex; regulates the material that enters the plant’s vascular tissues.
4. nonnucleated, cytoplasmic cell of the phloem.
6. plant tissue consisting of parenchyma, collenchyma, and sclerenchyma.
8. plant tissue that produces lateral roots
9. gaseous plant hormone that affects the ripening of fruits.
15. elongated, tubular plant cell that forms xylem strands (vessels) and conducts water and dissolved substances.
16. dermal tissue that makes up a plant’s outer covering. In humans and some other animals, the outer superficial layer of skin made up of epithelial cells.
17. layer of parenchyma cells that covers the root tip and helps protect root tissues during growth.
19. long, cylindrical plant cell in which water passes from cell to cell through pitted ends
20. layer composed of ground tissues between the epidermis and vascular tissue of a root
21. stalk that connects a plant’s blade to the stem.
22. nucleated cell that helps the mature sieve tube member function in transporting dissolved substances in the phloem of vascular plants.
23. leaf-tissue layer that contains many chloroplasts and is the site where most photosynthesis takes place.

1. group of plant hormones that are transported in vascular tissue and that can affect seed growth, stimulate cell division, and cause cell elongation.
2. response to an external stimulus in a specific direction.
5. one of a pair of cells that function in the opening and closing of a plant’s stomata by changes in their shape.
7. vascular plant tissue that transports water and dissolved minerals away from the roots throughout the plant and is composed of vessel elements and tracheids.
10. hairlike projections produced by some epidermal cells on leaves and stems.
11. loosely packed, irregularly shaped cells with spaces around them located below the palisade mesophyll.
12. process in which water evaporates from the inside of leaves to the outside through stomata.
13. plant hormone that moves in only one direction away from the site where it was produced and can stimulate the elongation of cells.
14. vascular plant tissue composed of sieve tube members and companion cells that conducts dissolved sugars and other organic compounds from the leaves and stems to the roots and from the roots to the leaves and stems.
18. reversible, responsive movement of a plant that occurs independent of the direction of the stimulus.