1. Lab 2
Plant Tissues

2. Plant tissues 1- meristematic tissues. a.Apical meristematic of root.
b.Apical meristematic of stem.
2-permanent tissues:
a.Ground tissue:.
1-parenchyma.
2-collenchyma.
3-schlerenchyma.
b.Dermal tissue.
c.vascular:
1-xylem phloem.

3. a.Apical meristematic of root (L.S)

4. L.S ----Longitudinal section . T.S ------ Transverse section .

5. 2-permanent tissues: Parenchyma: – thin walled & alive at maturity.
Function: 1-the most important function of the parenchyma cells of roots and stem is the storage of food (e.g. starch) and water
2-the intercellular air spaces permit gaseous exchange.

6. Parenchyma

8. Collenchyma – thick walled & alive at maturity.
Function:
*the collenchyma serve as supporting and strengthening tissue,
*in collenchyma with chloroplasts,
photosynthesis takes place.

10. Collenchyma

11. Sclerenchyma – thick walled and dead at maturity.
Function:
1-sclerenchyma is an important supporting tissue in plants,

13. Sclerenchyma

14. b.Dermal tissue.
Stomata
alive at maturity
Thin straight wall

15. *the stomata of leaves and stems allow gaseous exchange to take place which is necessary for photosynthesis and respiration,
*water vapour may be given off through the stomata during transpiration.

17. Complex Tissue Xylem –transport water and mineral salts.
Phloem – transport food from the leaf to all parts of plant .
*sieve tubes transport organic compounds,
*companion cells helps to regulate the metabolic activities of the sieve tube elements,
sieve-tube members (no nucleus at maturity, cytoplasm present), companion cells, fibers, parenchyma, and ray cells. 

18. c.vascular: 1-xylem.(L.S)
B.annular. –C.spiral.-D. helical - E.reticular. F. Scalari form G-pitted .

19. B.Annular.

21. 2-phloem.

24. Thank you for listening
T :Aldanah Alqahtani