Outline 23 2008 Nutrient procurement

Outline 23 2008 Nutrient procurement - Lecture 23: NUTRIENT...

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Lecture 23: NUTRIENT PROCUREMENT Summary . Autotrophs obtain nutrients from the air, water, and soil in the form of small inorganic molecules. For plants, the bulk of the plant mass actually comes from CO 2 from the atmosphere, but there are many additional compounds that plants need for growth. These come from the soil and water. These materials are taken up by the vast root and shoot systems of the plant. Plants and other autotrophs obtain some nutrients in large quantities (macronutrients), others in small amounts (micronutrients). One important nutrient is nitrogen, which can be fixed from the atmosphere by certain soil dwelling anaerobic prokaryotes. Some of these enter a symbiotic relationship with some plants and live in specialized root nodules. Heterotrophs obtain nutrients from preformed organic molecules, taken in as food. We have already discussed the breakdown of sugars, fats, and proteins by organisms, we now turn to a more detailed examination of the diets of animals including essential amino
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Outline 23 2008 Nutrient procurement - Lecture 23: NUTRIENT...

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