Lab 9 pt 2

Lab 9 pt 2 - J. Michael Lindle Mr. O AP Bio 4/27/10 Lab 9...

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J. Michael Lindle Mr. O AP Bio 4/27/10 Lab 9 Part 2 Definitions: A) Epidermis-in non-woody plants the outer tissue, or dermal tissue, is made up of a single layer of tightly packed cells, this layer is called the epidermis. The epidermis of the plant prevents morbid water loss and acts as a barrier to prevent disease from external threats. The epidermis has special functions based on the location of the plant such as the cuticle, which is a waxy extension that primarily serves to prevent water loss; root hairs in the roots also aid in water absorption and is an extension of the epidermis. B) Guard Cells-regulate the opening and closing of the stomata. Guard cells come in pairs. These pairs can be found around the opening in the leaf epidermis called the stoma. When guard cells are filled with water, they open the stoma which permits CO2’s entrance and allows water to transpire out. When the stomata are dry, they re- main closed which prevents water loss and gas exchange. C) Cuticle-a waxy coating found on the surface of leaves and stems of most plants. This layer is an extension of the epidermis and prevents water loss. D) Parenchyma Cell-is a part of the ground tissue in plants. A relatively unspecialized plant cell type that carries out most of the metabolism, synthesizes and stores organ- ic products, and develops into a more differentiated cell type. E) Collenchyma Cell-These cells primarily support the young ‘shoot’ of the plant. Their
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Lab 9 pt 2 - J. Michael Lindle Mr. O AP Bio 4/27/10 Lab 9...

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