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Nutrients in the Biosphere

Nutrients in the Biosphere. Section 13-3. Food Webs. Food Chains: sequence of organisms related to one another as food and consumer Food Webs : interconnecting food chains in an ecological community. Nutrients.

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Nutrients in the Biosphere

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  1. Nutrients in the Biosphere Section 13-3

  2. Food Webs • Food Chains: sequence of organisms related to one another as food and consumer • Food Webs: interconnecting food chains in an ecological community

  3. Nutrients • Organisms need more than just energy to survive; they also need nutrients • Nutrients: substances organisms use to build living tissue and to grow

  4. Trophic Levels • Primary producers (Autotrophs) • use solar energy and elements in soil to make their own nutrients • Consumers (Heterotrophs) • cannot make their own nutrients • they MUST eat other organisms to obtain them: • Herbivores: plants • Carnivores: meat • Omnivores: plants & meat • Decomposers:dead/decaying plant & animal matter • Parasites: live in/on “host” organism

  5. Ecological Pyramids • Used to show how energy flows through ecosystem • As move up each level: • Only 10% energy is available for next level • The # organisms decreases • The Biomass (total weight of living matter) decreases

  6. 1. What is a population? • 2. Name two factors that effect population.

  7. Nutrient Cycles • Only available in fixed amounts • Must be recycled throughout biosphere • Nutrient Cycle: path along which nutrients are passed from one organism to another and from one part of the biosphere to another

  8. The Water Cycle • 1) Water evaporates from earth into atmosphere (water vapor) • 2) Water is cooled, and condenses (liquid) • 3) Clouds form from water & particles in the air • 4) Water falls back to earth as precipitation (rain, snow, etc.)

  9. The Nitrogen Cycle • Nitrogen Fixation: bacteria convert nitrogen in atmosphere to usable form • 1) Nitrogen is used to make amino acids (proteins) for plants • 2) Heterotrophs eat plants, die, and decompose • 3) Nitrogen returned to atmosphere by bacteria and photosynthesis

  10. The Carbon Cycle • 1) Atmospheric CO2 is used by plants during photosynthesis • 2) CO2 is produced by all organisms during cellular respiration

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