stem anatomy

1. elongated, pointed cells grouped together to form strands
5. where a leaf grows on the stem
7. arrangement of veins in a leaf
11. a zone where plant cells become specific tissues
12. dead tissue, present in two forms; fibers and slereids
17. first formed primary phloem, consisting of narrow, sieve tubes, starts with the same letter(p)
19. spherical or oval, highly thickened dead cells
20. elongated cylindrical cells, tapering ends
22. waxy thick layer that covers the outer side of the epidermis
23. grow without soil, in air

2. a zone where plant cells increase in size
3. a specialized parenchymatous cell
4. what a cell wall is composed of
6. a type of root that elongates downward
8. branch root that arises from another root
9. elongated, tube-like cells with thick lignified walls and tapering ends
10. long tubes like structures, arranged longitudinally
13. a tissue system that forms the outermost covering of the plant body
14. roots outermost tip
15. later formed phloem that has bigger sieve tubes
16. living tissue, irregularly thickened at corners, provides mechanical support
18. appears early in the life of a plant, contributes to the formation of primary structures
21. long, cylindrical tube-like structure, made up of vessel members