1. ENERGY IN CELLS Class notes Monday, October 4th, 2010

2. Where do we get our energy from? Food that we eat! How did that food get its energy? Cells take energy stored in food and change it into different forms for all activities of life

3. Where does this energy in food come from? All of the energy comes from the sun: Solar energy! Plant cells Absorbs the sun’s energy and changes it into a form of energy that the plant can use We eat plants and other animals that eat plants This is how we get our energy!

4. Where does this process take place? Plants make their own food through PHOTOSYNTHESIS Plant cells have chloroplasts Chloroplasts contain chlorophyll (a green chemical) which traps the sun’s energy

5. PHOTOSYNTHESIS Turning solar energy into sugars Requires: Carbon dioxide Water Light energy

6. RESPIRATION We must break down the food moleculesinto energy our cells can use This is called RESPIRATION Requires: Oxygen Sugars to break down (food!)

7. Instructions: You will be assigned to be a carbon (C ), hydrogen (H) or oxygen (O) atom and we will act out the processes of photosynthesis and respiration Some students may also be theSUNand equals (arrow symbol: ) PHOTOSYNTHESIS equation: RESPIRATION equation: