2Two ways to get food “troph” = food Autotrophs Heterotrophs Auto = selfAutotrophs make their own foodHeterotrophsHetero = differentHeterotrophs get their food from something else (they have to eat it)
3Two ways to get foodAutotrophsPlantsHeterotrophsAnimals
5PhotosynthesisConverts the sun’s energy into chemical energy stored in sugarTakes place in specialized structures inside plant cells called chloroplastsChlorophyll is the pigment that absorbs sunlight.
6Photosynthesis Reaction 6CO2 + 6 H2O + lightenergy → C6H12O6 + 6O2The food plants make is called glucose (sugar)
7Photosynthesis 2 different reactions Light Reactions Calvin Cycle Capture light energy for photosynthesisCalvin CycleProduces glucose sugar
16Step 3 with oxygen: Cellular Respiration Oxygen required=aerobic2 more sets of reactions which occur the cell’s mitochondria1. Kreb’s Cycle – makes 2 ATPAlso called the Citric Acid Cycle2. Electron Transport Chain – makes ATP
20Energy Tally 36 ATP for aerobic vs. 2 ATP for anaerobic Glycolysis ATPKreb’s ATPElectron Transport 32 ATP36 ATPAnaerobic organisms can’t be too energetic but are important for global recycling of carbon