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Chapter 23 Review Sheet


									                                    Chapter 23 Review Sheet

Chapter 23
   1. In plants, the element that plays a critical role in the making of proteins and the

         development of roots, stems, and leaves is _________________________.

    2.   In phloem tissue, the activity of sieve tube elements is believed to be controlled by


    3. The tissue that enables roots to grow thicker and branch is the ____________________.

    4. The roots of grasses are ____________________ roots.

    5. The tissue that enables plants to grow from their tips as long as they live is the


    6. Water loss from tree bark is prevented by ___________________________.

    7. In roots, the outermost layer of cells that absorbs water and nutrients is the


    8. If a plant receives too much fertilizer, it may suffer from ______________________.

    9. White potatoes, which store food in thick, underground stems, are


    10. The waterproof, waxy coating of many leaves is the ___________________________.

    11. In the complex mixture of soil, decaying plant and animal matter make up the


    12. The number of tree rings can be used to determine the _________________________.

    13. The opening and closing of stomata is controlled by changes in


    14. The upper layer of mesophyll in a leaf is the __________________________.

    15. A mangrove tree, whose roots are in mud, obtains oxygen through large spaces in

16. List the major elements required in plants.

17. In angiosperms, xylem tissue consists of tracheids and _________________________.

18. Phloem tissue consists of companion cells and ______________________________.

19. The top layer of a soil profile is ____________________.b

20. The only plant tissue that produces new cells is __________________ tissue.

21. When plants lose too much water and begin to wilt, their stomata


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