Cells differentiate to form the three major tissue

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Unformatted text preview: em cells. Secondary growth makes stems and roots grow thicker. • Cells differentiate to form the three major tissue types: • Dermal tissue: covers the outer surface of plants • Vascular tissue: pipelines that transport water, dissolved minerals, and sugars • Ground tissue: Just about everything else; tissues that carry out photosynthesis, storage, and support. • Dermal tissue: • Epidermis: the “skin” of the plant, often as thin as one cell layer. May have a waxy cuticle layer on top, and may have various hairs growing out of it. (Cotton is a type of hair growing out of the epidermis of the seeds of the cotton plant.) • Periderm: composed of a layer of cork cells, forms the outer covering of roots and stems in woody plants, and the outer layer of bark. • Ground tissue: The “-enchyma” triplets • Parenchyma: thin-walled cells, alive at maturity, with many different functions, including photosynthesis, food storage, hormone production. Examples: the fleshy parts of edi...
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