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Nutrient Cycles

Nutrient Cycles. Cycling maintains homeostasis (balance) in the environment. 3 cycles to investigate: 1. Water cycle 2. Carbon cycle 3. Nitrogen cycle. Water cycle- Evaporation- is a type of vaporization of a liquid to gas phase from the surface of a liquid.

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Nutrient Cycles

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  1. Nutrient Cycles Cycling maintains homeostasis (balance) in the environment. • 3 cycles to investigate: 1. Water cycle 2. Carbon cycle 3. Nitrogen cycle

  2. Water cycle- • Evaporation- is a type of vaporization of a liquid to gas phase from the surface of a liquid. • Transpiration- evaporation of water from plant leaves. • (diagram on next page) • Condensation- change of the physical state of matter from gas phase into liquid phase, and is the reverse of evaporation. • Precipitation- any product of the condensation of atmospheric water vapor that falls under gravity.

  3. Water cycle-

  4. Carbon cycle- • Photosynthesis and respiration cycle carbon and oxygen through the environment.

  5. The chemical equation for photosynthesis is: • 6CO2 + 6H2O ------> C6H12O6 + 6O2Sunlight energy • CO2 = carbon dioxideH2O = waterLight energy is requiredC6H12O6 = glucoseO2 = oxygen • The chemical equation for respiration is: • C6H12O6 + 6O2 6CO2 + 6H2O • Glucose + Oxygen Carbon Dioxide + Water

  6. Carbon cycle-

  7. Nitrogen cycle- Atmospheric nitrogen (N2) makes up nearly 78%-80% of air. Organisms can not use it in that form. Lightning and bacteria convert nitrogen into usable forms.

  8. Nitrogen cycle- Nitrogen-fixing bacteria: rhizobacteria Some live in a symbiotic relationship with plants of the legume family (e.g.,alfalfa soybeans, clover, peas, peanuts).

  9. Nitrogen cycle- • Some nitrogen-fixing bacteria live free in the soil. • Nitrogen-fixing bacteria: cyanobacteria are essential to maintaining the fertility of semi-aquatic environments like rice paddies.

  10. Nitrogen cycle- Only in certain bacteria and industrial technologies can fix nitrogen. Nitrogen fixation-convert atmospheric nitrogen (N2) into ammonium (NH4+) which can be used to make organic compounds like amino acids. N2 NH4+

  11. Nitrogen Cycle Atmospheric nitrogen Lightning Denitrification by bacteria Animals Nitrogen fixing bacteria Plants Decomposers Nitrification by bacteria Nitrites Nitrates Ammonium

  12. Toxins in food chains- While energy decreases as it moves up the food chain, toxins increase in potency. • This is called biological magnification Ex: DDT & Bald Eagles

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