1-30-08

1-30-08 - Bio 271 1-30-08 Read box on page 136 Simple- 1...

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Bio 271 1-30-08 Read box on page 136 Simple- 1 cell type Complex- more than one cell type Vacular o Xylem o Phloem Parenchyma sclerenchyma and collenchyma cell tissues Parenchyma cells Remain living throughout maturity and have many functions Collenchyma cells- Usually in outer cortex of petioles or stems Sclerenchyma cells- Non living at maturity All is lost except the wall Long strong but flexinle fiers or short nearly isodiametric strong and rigid Functions o Support o Strength o Flexible o Protection Star sclerids o In the petals of aqueous plants Vascular cells: Tracheids
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Bio 271 o Cells that as they develop elongate and develop secondary walls and then programmed cell death o Arise from procambium cells o Pits form which are areas for cellular water conduction o Multiple tracheids are needed in order to function o Water moves mostly thorugh the pits in these cells Vessel emelents o Derived from tracheids o Perforations near or at the end of the cells
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1-30-08 - Bio 271 1-30-08 Read box on page 136 Simple- 1...

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