Lab 2 Plant Tissues.

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Presentation transcript:

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.

a.Apical meristematic of root (L.S)

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

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.

Parenchyma

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

Collenchyma

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

Sclerenchyma

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

*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.

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.

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

B.Annular.

2-phloem.

Thank you for listening T :Aldanah Alqahtani