Plant Tissues. Tissue Collection of cells with a similar function. Plant Tissues Dermal Ground Vascular.

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Presentation transcript:

Plant Tissues

Tissue Collection of cells with a similar function. Plant Tissues Dermal Ground Vascular

Meristematic Cells Unspecialized. –Divide and differentiate into specialized tissues.

Meristematic Cells Plant growth via mitosis only at meristems. Primary Growth (Length) Occurs at apical meristems (tips of shoot, leaves and roots). Secondary Growth (Width) Vascular cambium (between xylem & phloem in dicots). –Grows new xylem & phloem. Cork cambium (outer layer of woody stem). – Grows new cork.

Dermal Tissue Forms outermost layer of a plant. Epidermis can be specialized: –Form root hairs to absorb water and minerals. –Produce a waxy waterproof cuticle on leaves.

Ground Tissue Located between the dermal and vascular tissue. Perform a variety of functions: –Photosynthesis. –Food and water storage. –Structural support.

Ground Tissue Parenchyma Photosynthetic. Carry out metabolic reactions. Food and water storage. Collenchyma Structural support where growth occurs. Sclerenchyma Structural support.

Vascular Tissue Xylem Transports water and dissolved minerals from the roots to the leaves. Phloem Transports sugar solution from the leaves to the roots.

Vascular Tissue Xylem Vessel elements (angiosperms) Tracheids (gymnosperms) – Dead cells arranged end to end (perfora) and side by side (pit).

Vascular Tissue Phloem Sieve tube –Interconnected with perforations. –Lack nuclei. Companion cells –Actively transports sugars into & out of sieve tubes.

Useful Links ssification/section2.rhtmlhttp:// ssification/section2.rhtml ges/P/PlantTissues.htmlhttp://users.rcn.com/jkimball.ma.ultranet/BiologyPa ges/P/PlantTissues.html nicalsciences/plantsstructure/plantsstructure/plant sstructure.htm#Phloemhttp:// nicalsciences/plantsstructure/plantsstructure/plant sstructure.htm#Phloem ng/BI102/Elements/31_06PlantTissueSystems_L.j pghttp:// ng/BI102/Elements/31_06PlantTissueSystems_L.j pg BK/rootstr.gifhttp:// BK/rootstr.gif