Exam 3 Notes

10 14 xylemconductswaterandmineralsfromroots o

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Unformatted text preview: between roots and shoots Xylem – conveys water and minerals up 13 from roots Phloem – transports organic nutrients from sources to sinks o Ground Tissue – various functions including storage, photosynthesis, and support o Figure 35.8 Differentiated Plant Cells o Parenchyma Thin flexible 1 degree cell walls; alive at maturity; carry out most metabolism within plant o Collenchyma Unevenly thickened, but flexible 1 degree cell walls; alive at maturity; supports young growing stems o Sclerenchyma Thick, rigid 2 degree cell walls; dead at maturity; provides support o Figure 35.10 14 Xylem: conducts water and minerals from roots o Tubular cells; dead at maturity Tracheids: thin, tubular cells; cell walls contain pits (thin regions with only 1 degree walls) Vessel elements: short, wide tubular cells Phloem: conducts organic compounds o Sieve­tube members: conducting cells: alive, but not many organelles o Companion cells: non­conducting cells: alive and supports sieve­tube members o Figure 35.10 (see next page) 15 Conc...
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