EEMB 127 Lecture Notes - Lecture 4: Rolling Paper, Sclereid, Tracheid
8 Feb 2018
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Sclerenchyma: these are living specialized parenchyma cells that contain numerous chloroplasts, these have evenly thickened secondary walls. Thick + tough secondary wall means lignin highly deposited. It can be continuous masses, small groups or individual cells. It"s dead at maturity, but provides support: examples, sclereids, fibers support. They are both considered sclerenchyma because they are both dead at maturity but still provides. Fibers: elongated, very thick cell walls, dead at maturity, may have a long narrow cavity inside or be filled with secondary cell wall, assembled in strands or bundles. Fibers are long, slender cells that occurs in strands or bundles. Sclerenchyma also occurs in stems as reinforcing struts outside the vascular tissue. lumen, in which the lumen is an empty space in the center of a non-living cell bounded by secondary cell walls. Hemp, jute, and flax fibers these are all annuals, and the fibers are composed primarily of.
