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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), re²ect light / deter animals (t), increase root SA (rh) Plant Tissue Types Plant Tissue Types...
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- Fall '09
- phloem, Vascular plant, Plant anatomy, plant tissue types