1. PlantTissues

2. Tissues are groups of cells with similar structure, origin and function. • Plant tissues can be divided into two types: • meristematic(perpetually young tissues important in growth)‏ • permanent • Simple tissue is composed of one kind of cell. • Complex tissue is composed of two or more kinds of cells.

3. Meristematic Tissues are groups of cells that have the ability to divide. Characteristic: • the cells are small • the cell walls are thin • cells have large nuclei • vacuoles are absent or very small • no intercellular spaces Locations: tips of roots, stems, buds

4. Permanent Tissues • are derived from meristematic tissues. • They have lost the power of dividing. • Simple permanent tissues: • Parenchyma • Collenchyma • Sclerenchyma • Examples of complex permanent tissues: • Xylem (commonly called wood)‏ • Phloem (commonly called bast)‏ • Epidermis

5. Parenchyma tissue • Characteristic: • cells remain alive at maturity • thin-walled cells • isodiametric shape • intercellular spaces • widespread occurrence in the plant body(leaves, root, stem)‏

6. Parenchyma tissue under a microscop i - intercellular space bs – cell walls

7. Types of Parenchyma • In the different regions of the plant body parenchyma cells are involved in different functions. • For example: Aerenchyma • The cells enclose large • intercellular spaces that are • filled with air. Aerenchyma • helps to transport oxygen • produced during photosynthesis. • It is characteristically found in aquatic floating plants.

8. Collenchyma Tissue • Characteristic: • cells remain alive at maturity • cell walls are thickened • intercellular spaces absent or very small • occurence in the peripheral regions of stems and leaves

9. Collenchyma Tissue Stalk of begonia under a microscop par – parenchyma kol – collenchyma e – epidermis (covers the plant)‏ bs – cell walls

10. Sclerenchyma Tissue • Characteristic: • Mature sclerenchyma cells are dead • Cells have thick secondary walls • Occurence in shellsand the outer hard coat of many seeds

11. The shell of walnut as an example of sclerenchyma tissues

12. Questions for youWhich are the growth tissues of plants? The growth tissues of the plants are the meristems.

13. Which are the plant tissues responsible for supporting of the plant?? The plant supporting tissues are the collenchyma and the sclerenchyma.

14. Which is the plant tissue responsible for filling of the space between other tissues? The plant-filling tissue is generically called parenchyma.

15. Which tissue does the husk of a coconut contain?? SclerenchymaSclerenchymatous cells are dead cells. The fibrous husk of coconut is also dead.

16. Resources • Internet: • http://botanika.wendys.cz/slovnik/foto.php?80_1 • http://botanika.wendys.cz/slovnik/foto.php?81_1 • http://www.odmaturuj.cz/biologie/rostlinna-pletiva/ • http://botanika.borec.cz/o_pletiva.php#deliva • http://www.biologie.webz.cz/www/botanika/anatomie.html • Literature: • Kincl:Botanika

17. Created by Denisa Romanovska