Plant Tissue Types KEY - peach pits, gritty nature pears/gs...

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Tissue Subtypes Characteristics Alive or Dead 1°, 2° or Both Function Examples Parenchyma Spongy and Palisade among others thin walls, can divide, most common cell type, found in leaves, stem centers, roots, fruit alive storage photosynthesis (contain chloroplasts) potato tubers, leaf photosynthetic cells Collenchyma N/A similar to parenchyma but with thicker cell walls, found in strands along leaves, veins, stalks alive support growing plant parts, stiffen leaves and stems celery strings Sclerenchyma Fibers Sclereids thick cell walls with imbedded lignin dead support (±bers reinforce the xylem), structure, protection (sclereids in nuts) loufa, rope ±bers (hemp, jute, ²ax), walnut shells,
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Unformatted text preview: peach pits, gritty nature pears/gs Xylem Tracheids Narrow, long; over-lapping, pitted end walls dead Both transport water in plant Vessel Elements Wide, open end walls; angiosperms only Phloem Sieve Elements Form sieve tubes, sieve plate on ends, no nucleus alive Both transport nutrients in plant Companion Cells Keeps sieve element alive Epidermis stomata tricomes root hairs one cell layer deep, very tightly knit together, covered with waxy cuticle alive 1 protection from environment, pores to facilitate gas exchange (s), reect light / deter animals (t), increase root SA (rh) Plant Tissue Types Plant Tissue Types...
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This note was uploaded on 02/24/2010 for the course BIO General Bi taught by Professor Mehgian during the Fall '09 term at University of California, Berkeley.

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Plant Tissue Types KEY - peach pits, gritty nature pears/gs...

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