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Unformatted text preview: ble fruits and vegetables.
• Collenchyma: Long cells that are alive at maturity, but no longer divide. Cell walls are thick, but flexible.
Used as support cells. Examples: Celery strings.
• Sclerenchyma: Cells that may be long and stringy or short and blocky, but have thick cell wall stiffened
with lignin. Used as support. Examples: “pear grit” (the gritty cells in the flesh of pears), plant fibers such
as linen and hemp, cells that form nut shells.
• Vascular tissue
• Xylem: composed of hollow, dead cells that transport water and dissolved minerals from roots to leaves. Notes Biology 103, Spring 2008
Dr. Karen Bledsoe
http://www.wou.edu/~bledsoek/ • Phloem: made up of living cells that transport dissolved sugars either up or down plant as needed.
• Plant organs:
• Leaves: made up of a blade and a petiole. On the underside, stomata, allow air into and out of the
spongy ground tissue, the mesophyl, where photosynthesis takes place. Vascular bundles bring water
into a leave, and carry sugars away.
• Stems: supports the leaves and...
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