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Biology - Day 5.docx

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Department
Biology
Course
BIOL 1130
Professor
Berkley
Semester
Fall

Description
Wednesday September 19, 2012 Plant Biology – Day 5 Complex Tissue  1 type of cell Xylem - Transports H O2& nutrients from roots - Will have parenchyma cells, tracheids, vessels, fibers - Tracheids, vessels  Dead at maturity - Tracheids have overlapping pits vs. vessels which are attached end to end - Ray cells  transport H O2+ nutrients laterally when there is secondary growth Phloem - Transport sugars from the leaves - Transport Cells are termed  Sieve Tube members - Joined together where there is a Sieve Plate - Are alive at maturity  cytoplasm extends through the sieve plate to the cells - Sieve tube members lack organelles like mitochondria, dictyosomes, ribosomes, vacuole - Have companion cells associated with the sieve tube members which supply needed substances o
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