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2.4 ENERGY FLOW IN ECOSYSTEMS

2.4 ENERGY FLOW IN ECOSYSTEMS. SNC 1D: SUSTAINABLE ECOSYSTEMS UNIT. Types of energy. Radiant energy = energy radiated from the Sun ; source of most energy needed by organisms to live. Light energy is visible radiant energy

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2.4 ENERGY FLOW IN ECOSYSTEMS

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  1. 2.4 ENERGY FLOW IN ECOSYSTEMS SNC 1D: SUSTAINABLE ECOSYSTEMS UNIT

  2. Types of energy • Radiant energy= energy radiated from the Sun; source of most energy needed by organisms to live. Light energy is visible radiant energy • What happens to radiant energy? 70% is absorbed by hydro- and lithosphere and converted to thermal energy; 30% is reflected back into space. • Thermal energy= form of energy transferred during heating or cooling.

  3. Chemical Energy • Chemical energy can be stored in cells and released when needed by organisms for processes such as growth and reproduction.

  4. Photosynthesis • What is photosynthesis? • Process by which Sun’s energy is converted into chemical energy by green pigment called chlorophyll • Organisms that use this process to make their own food are called producers (green plants, algae, cyanobacteria) • Word equation for photosynthesis: Light energy carbon dioxide + water  sugar + oxygen

  5. Photosynthesis Image

  6. What happens to sugar produced from photosynthesis? • Some is stored in roots, stems, leaves and seeds of plants as starch (storage compound) • Some used to build complex carbohydrates or proteins

  7. Discovery of photosynthesis: video clip • http://www.youtube.com/watch?v=pdgkuT12e14

  8. Cellular Respiration • Process by which sugar is converted into carbon dioxide, water and energy • Released energy is used to carry out cellular activities • Word equation for cellular respiration: sugar + oxygen  carbon dioxide + water + energy

  9. Relationship between cellular respiration and photosynthesis

  10. Difference between consumers and producers • Consumers cannot photosynthesize; therefore, they rely on producers to obtain energy. • Both producers and consumers can undergo cellular respiration.

  11. Overview video • http://www.youtube.com/watch?v=o_RBHfjZsUQ

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