Plant Anatomy Lab Key - Plant Anatomy Lab Key Answer these...

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Plant Anatomy Lab Key Answer these questions for Part 1: 1. List 3 functions for each of the major plant parts; roots, stems and leaves. Stems – support, transportation, photosynthesis for herbaceous plants Roots – absorption, anchorage, transport, storage Leaves – photosynthesis, light absorption, transpiration 2. Where in the root are the cells that have secondary walls located? In the center. Answer these Questions for Part 2 : 1. Describe the characteristics of primary and secondary cell walls. Primary cell walls are composed mostly of cellulose and are somewhat stretchable. They may be thin and delicate or thick and tough. They are found in living cells that are actively carrying on metabolic activities. Secondary cell walls are laid down after a cell matures. The protoplast often dies after depositing the secondary wall, so no further metabolic activities take place. Secondary walls are strong and rigid and are mostly found in specialized cells that have a support function. Lignin preserves the secondary cells walls as well as strengthening them. (ex: wood) 2. Define the three tissue systems. Dermal - epidermis Ground – parenchyma, collenchyma, and sclerenchyma Vascular – xylem and ploem Maristematic – primary maristem, cambium and pericycle 3. Describe the general functions of dermal tissue. Outer covering that protects and regulates the passage of materials in and out of the plant. 4. Explain how and why the epidermis of roots and stems differs. The stem most likely with have cuticle to prevent drying out while the root will not so that it can absorb waters and minerals. 5. Explain the function of guard cells. Guard cells regulate the stomata to control the amount of carbon dioxide that enters and water from transpiring. 6. How are the guard cells different from the other epidermal cells? They contain chloroplasts and are also a different shape. 7. What is the purpose of root hairs? To increase surface area for the root.
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Answer these questions for Part 3: 1. Describe the general functions of parenchyma tissue in stems and leaves. Photosynthesis 2. Why are the leaf parenchyma cells so loosely packed? (Hint: The spaces between the parenchyma cells are continuous with the stomata.) Carbon dioxide can circulate freely among the parenchyma cells via the intracellular spaces. 3. Why do root cells require oxygen? They need it for aerobic respiration, just like the rest of the plant. When soil becomes packed or water-logged, roots don't get enough oxygen to metabolize. 4.
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This note was uploaded on 10/04/2011 for the course BSC 2010 taught by Professor Thomas during the Spring '07 term at University of Central Florida.

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Plant Anatomy Lab Key - Plant Anatomy Lab Key Answer these...

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