Photosynthesis How do we grow a plant? But is that all???? Plants need to do Photosynthesis Chlorophyll inside What you don’t see… Photosynthesis- what goes in? Sunlight (light Energy) Water H2O Carbon Dioxide CO2 Photosynthesis- what comes out? Sunlight (Light Energy) Glucose C6H12O6 Water H2O Oxygen Carbon Dioxide CO2 O2 Photosynthesis Let’s write the chemical equation on the board!! What are the reactants, What are the products? Reaction CO2 + H2O + light O2 + C6H12O6 But it’s not balanced 6 CO2 + 6 H2O + light 6 O2 + C6H12O6 Reactants What type of energy transformations are going on? Products Photosynthesis has an “opposite” reaction… ALL cells must perform this reaction – (not like photosynthesis that only occurs in autotrophs) – Occurs in Mitochondria – It’s why we breathe In fact the name we give to breathing is named after this cellular process – Any guesses??? Cell Respiration Carbon Dioxide Glucose CO2 C6H12O6 Water H2O Oxygen O2 Energy Cell Respiration Let’s draw the chemical formula on the board!! What are the reactants, What are the products? What type of energy transformations are going on? It’s a cycle in plant cells, Jennnnay The process of cellular respiration is taking place in your cells right now!! You are currently taking in oxygen and burning sugars within the mitochondria to release chemical energy. This process is also known as Aerobic Respiration. Why? – Because Oxygen is present which allows your cells to burn glucose into energy much more efficiently. – I am sure you have heard of Aerobics. What would happen if your cells were deprived of oxygen?? Would they still be able to burn glucose to make energy?? YES!! Fermentation – When might this occur? – Long distance runners often create an anaerobic environment for their cells What does anaerobic mean?? – No Oxygen present – Not a very energy efficient process and a bad side effect is produced: Lactic Acid A different example of fermentation Breweries rely on this process: – Yeast cells need energy to survive, so they will breakdown sugars in anaerobic conditions and a byproduct is alcohol. – How do you know CO2 is produced? Fermentation Anaerobic Animals produce lactic acid and CO2 Plants produce ethyl alcohol and CO2 Less efficient…pgs 124-125 – Aerobic respiration yields at least 36 ATP – Anaeorobic nets a measly 2 ATP Let’s fill in this chart with the molecules and then the energy transformations _____________________ _________________________________ _________________________________ _____________________ Why do leaves change colors?? Carotene Xanthophyll Chlorophyll A Chlorophyll B These chromatograms show chlorophyll b at the bottom, followed by chlorophyll a, xanthophylls, and carotenes.