lab 2 plant tissues. plant tissues 1- meristematic tissues. a.apical meristematic of root. b.apical...
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Lab 2
Plant Tissues
Plant tissues1 -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.
Thin straight
wall
Stomata
alive at maturity
*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.
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Thank you for listening
T :Aldanah Alqahtani