Download - The Acquisition of Plant Nutrients Photosynthesis in General Light + CO 2 + H 2 O C 6 H 12 O 6 + O 2
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The Acquisition of Plant Nutrients
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Photosynthesis in General
Light + CO2 + H2O C6H12O6 + O2
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General Plant Anatomy
• Roots support the plant and absorb water and important nutrients
• Leaves absorb the sunlight
• Stoma on the leaves open to absorb carbon dioxide gas
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Root Anatomy
• A section of root contains epidermal and endodermal layers
• The endodermal layer is impregnated with a water tight casparian strip and contains the vascular cylinder (made of xylem and phloem)
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Epidermal Function
• Epidermis cells increase their surface area for absorption with root hairs
• The root manipulates solute concentration so that water will move by osmosis into the vascular cylinder
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Capillarity in the Xylem
• Water’s cohesive and adhesive properties allow it to move up the xylem through capillarity.
• The thinner the xylem the higher the water will rise
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Transpiration and the Stoma
• When stoma open to acquire carbon dioxide, water evaporates (transpires) causing an area of low pressure so that water flows from the root where the water is at a higher pressure
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CO2 & Light Acquisition
• The palisade layer contains packed columnar cells for intercepting light
• The spongy layer is open for the movement of CO2 that enters through the stomata
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Photosynthesis in the Leaf
• CO2 + H2O + light O2 + C6H12O6
• Radiant Energy in Sunlight is converted into the chemical energy of Carbohydrates or Sugar
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Translocation in the Phloem
• Once sugar is created, it is loaded into the phloem
• This increases the concentration of solutes causing water to move by osmosis and create pressure causing the sugar to flow