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Bell Ringer

Bell Ringer. What substances are need for photosynthesis and what are produced during photosynthesis? You have 5 minutes to get a piece of paper and write down the answer. Chapter 2 Ecosystems and Biomes. Section 2 Cycles of Matter Notes 2-2. Recycling Matter.

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Bell Ringer

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  1. Bell Ringer What substances are need for photosynthesis and what are produced during photosynthesis? You have 5 minutes to get a piece of paper and write down the answer.

  2. Chapter 2Ecosystems and Biomes Section 2 Cycles of Matter Notes 2-2

  3. Recycling Matter • Matter is recycled in ecosystems • Like cans are recycled • Ex: water, carbon, oxygen, nitrogen • Energy is not recycled in ecosystems • Sunlight or gasoline must be constantly supplied • Enters at the producers and moves through the consumers until it is gone

  4. Water Cycle • Water is necessary for all life as we know it • What scientists are looking for on other planets to find other life • Water Cycle: continuous process by which water moves form Earth’s surface to the atmosphere and back

  5. Water Cycle • Evaporation: • Process in which molecules of liquid water absorb energy and change into the gas state • Liquid water to water vapor • Plants lose water from their leaves = transpiration • Animals lose water when they exhale

  6. Water Cycle • Condensation: • Process by which a gas changes into a liquid • When water cools, the vapor changes into a liquid • Water droplets can form around a small piece of dust and form a cloud or rain drop

  7. Water Cycle • Precipitation: • When water falls back to the earth • Form of rain, snow, sleet or hail • Precipitation becomes groundwater when it reaches the soil or it can become part of a river or ocean

  8. Carbon and Oxygen Cycle • Carbon is the building block of that matter that makes up all living things • Found in the atmosphere in the form of carbon dioxide • Producers take in carbon dioxide during photosynthesis

  9. Carbon and Oxygen Cycle • Producers use carbon (from CO2) to make carbon-containing molecules • Like sugars and starches • Consumers use sugars and starches for energy • Give off water and carbon dioxide as waste • Producers give off oxygen as waste • Consumers use oxygen in their life processes

  10. Nitrogen Cycle • Atmosphere is 78% Nitrogen (N2) • However, most organisms can’t use nitrogen from the air • Nitrogen gas is called “free” nitrogen • Must be “fixed” or combined with other atoms to be used by most organisms

  11. Nitrogen Cycle • Nitrogen Fixation: • Process of changing free nitrogen gas into the usable form of nitrogen • Most is done by nitrogen-fixing bacteria • These bacteria are found in nodules on the roots of plants • Plants like: clover, beans, peas, alfalfa and peanuts

  12. Nitrogen Cycle • Farmers use legumes (alfalfa) to build up the nitrogen compounds in the soil • After planting other crops for a couple of years, farmers plant legumes to re-enrich the soil • Called crop rotation

  13. Nitrogen Cycle • Nitrogen is used by organisms to build proteins and other substances • Decomposers break down these substances of dead matter • They return it to the soil • Bacteria can also release free nitrogen back into the atmosphere

  14. HOMEWORK Section Review Page 55 #1-5

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