2 Two 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)
3 Two ways to get foodAutotrophsPlantsHeterotrophsAnimals
5 PhotosynthesisConverts 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.
6 Photosynthesis Reaction 6CO2 + 6 H2O + lightenergy → C6H12O6 + 6O2The food plants make is called glucose (sugar)
7 Photosynthesis 2 different reactions Light Reactions Calvin Cycle Capture light energy for photosynthesisCalvin CycleProduces glucose sugar
16 Step 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
20 Energy 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