Notes Mar 2nd- exam 2

Notes Mar 2nd- exam 2 - Symbiosis and Plant Nutrition...

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Symbiosis and Plant Nutrition Mycorrhizae Nitrogen Fixation Epiphytes- Mutualistic with host Epiphylls- moss plants that grow on surfaces of leaves, commenalistic Parasites- mistletoe on oak trees; send roots into vascular tissue of oak tree Providing Surfaces for Photosynthesis for leaves How to maximize the surface for photosynthesis, broad flat leaves How to get CO2 into the leaf How to get CO2 out of leaf How to minimize water loss- approx 10% of water is used for photosynthesis and other 90% is lost to the environment Structure of the leaf Cuticle- waxy covering to limit water loss Epidermis- Cover the cuticle, have chlorophyll Mesophyll Pallisade Layer- main area where photosynthesis occurs Spongy Mesophyll- loosely organized tissue in the middle of the leaf with space for air and gas exchange taking place Xylem and Phloem Tissues-transport tissues Lower Epidermis Guard Cells and Stomata What things increase potassium ions? Sunlight, adequate water
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