36 - How do plants acquire nutrients Nutrients the major ingredients for macromolecules carbon hydrogen oxygen nitrogen Carbon enters the living

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How do plants acquire nutrients? Nutrients : the major ingredients for macromolecules: carbon, hydrogen, oxygen, nitrogen. Carbon enters the living world from CO2 in the atmosphere through fixation by photosynthesis. Hydrogen and oxygen enter as water. These three elements are in plentiful supply. In the soil, these and other minerals are dissolved in the soil solution Plants, some protists, and some bacteria, are autotrophs. Heterotrophs require pre-formed organic molecules and depend directly or indirectly on autotrophs for food Some are chemolithotrophs , using energy from reduced inorganic compounds such as H2S. All are bacteria. Plants grow towards nutrients and water Microenvironmental conditions can encourage or discourage growth of roots. For example, animal droppings create local high concentrations of nitrogen. What mineral nutrients do plants require? Except for nitrogen, all the minerals required by plants are derived from rock—usually taken up from soil solution An essential element is one required for the plant to complete its life cycle, and cannot be replaced by another element Macronutrients : need at least 1 g per kg of dry plant matter: N (proteins, nucleic acids, etc), K (stomata cells opening- guard cells, enzyme activation, water balance, ion balance), P (nucleic acids, ATP, phosphorylization of enzymes), S (in proteins and coenzymes), Ca (membranes, cytoskeleton formation, spindle formation, etc.), Mg (chlorophyll, cofactor for enzymes, stabilizes ribosomes),
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This note was uploaded on 04/24/2008 for the course BIOLOGY 020.152 taught by Professor Pearlman during the Spring '08 term at Johns Hopkins.

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36 - How do plants acquire nutrients Nutrients the major ingredients for macromolecules carbon hydrogen oxygen nitrogen Carbon enters the living

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