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Energy Transfer Through an Ecosystem

Energy Transfer Through an Ecosystem. Objectives: By the end of the lesson you should be able to… -recall how energy enters and is transferred through an ecosystem. -recall how energy is lost from an ecosystem -calculate net productivity of photosynthesis

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Energy Transfer Through an Ecosystem

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  1. Energy Transfer Through an Ecosystem Objectives: By the end of the lesson you should be able to… -recall how energy enters and is transferred through an ecosystem. -recall how energy is lost from an ecosystem -calculate net productivity of photosynthesis -quantitatively consider energy transfer between trophic levels.

  2. Key Stage 3/4 revision Key ideas… • Producer-makes its own food by photosynthesis (autotroph) • Consumer-eats to gain food (heterotroph) • Trophic level-each level in a food chain • Arrows in the food chain represent the flow of energy from one organism to another. • Biomass is the dry mass of an organism (minus any water) Answer questions P199 of Heinemann A2 text book.

  3. Where does energy in an ecosystem come from? • Why is not all light energy transferred into chemical potential energy? • At each trophic level-why is not all energy converted into biomass?

  4. Productivity of Photosynthesis • Ultimate products of photosynthesis are - NADP -ATP -Glucose • Not all light energy captured is transferred into chemical potential energy. • Gross productivity is the rate at which chemical energy is stored by plants. These are chemical potential energy. Net productivity = gross productivity – respiration losses

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