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Lab 2

Lab 2. Plant Tissues. 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. 2-phloem.

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Lab 2

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  1. Lab 2 Plant Tissues

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

  3. a.Apicalmeristematic 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

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

  8. Collenchyma

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

  10. Sclerenchyma

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

  12. *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.

  13. 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. 

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

  15. B.Annular.

  16. 2-phloem.

  17. Thank you for listening T :AldanahAlqahtani

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