Name_________________________________ Period_____ Date_____________ Objective: SWBAT compare cellular respiration and photosynthesis. DO NOW Activity #1 Activity #2 Exit Quickly scan the cartoon. What do you notice first? VOCABULARY Cellular Respiration Photosynthesis Mitochondria ACTIVITY #1 PHOTOSYNTHESIS VS. CELLULAR RESPIRATION Cellular Respiration and photosynthesis can be thought of as opposite processes. Energy flows in opposite directions in the two processes. Complete the table using the phrases listed below: Green plant cells Chloroplast Release energy from food CO2 + H2O + ATP Glucose + O2 All cells Mitochondria Capture & Store energy Glucose + O2 CO2 + H2O + light PHOTOSYNTHESIS CELLULAR RESPIRATION What is its purpose? What type of cells do this? What organelle in the celldoes this? Reactants (What is being consumed) Products 1 1. Write the equation for each process: a. Photosynthesis: b. Respiration: 2. Which process: a. Releases energy for the cell? b. Stores energy for the cell? 3. What type of energy: a. Is used to make food during photosynthesis? b. Is made during respiration? 4. How do the products of photosynthesis compare to the reactants of respiration? ACTIVITY #2 How do trees help you breathe? Recall that trees release oxygen as a byproduct of photosynthesis. And you need oxygen to breathe. Do you know why? So your cells can perform cellular respiration and make ATP. Connecting Cellular Respiration and Photosynthesis Photosynthesis and cellular respiration are connected through an important relationship. This relationship enables life to survive as we know it. The products of one process are the reactants of the other. Notice that the equation for cellular respiration is the direct opposite of photosynthesis: Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O Photosynthesis: 6CO2 + 6H2O → C6H12O6+ 6O2 Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water. While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration. We breathe in that oxygen, which is carried through our blood to all our cells. In our cells, oxygen allows cellular respiration to proceed. Cellular respiration works best in the presence of oxygen. Without oxygen, much less ATP would be produced. Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere. While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere. The exchange of carbon dioxide and oxygen during photosynthesis (Figure below) and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at stable levels. Cellular respiration and photosynthesis are direct opposite reactions. Energy from the sun enters a plant and is converted into glucose during photosynthesis. Some of the energy is used to make ATP in the mitochondria during cellular respiration, and some is lost to the environment as heat. 2 1. What kinds of organisms perform photosynthesis? 2. What are the reactants and the products of photosynthesis? 3. How is energy converted and stored in the process of photosynthesis? 4. What kinds of organisms perform cellular respiration? 5. What are the reactants and products of cellular respiration? 6. How is energy converted and stored in the process of cellular respiration? 7. How are the reactants and products of photosynthesis and cellular respiration related? REGENTS QUESTIONS 1. An inorganic molecule required by green plants for the process of photosynthesis is (1) oxygen (2) starch (3) carbon dioxide (4) glucose 2. Eating a sweet potato provides energy for human metabolic processes. The original source of this energy is the energy (1) in protein molecules stored within the potato (2) from starch molecules absorbed by the potato plant (3) made available by photosynthesis (4) in vitamins and minerals found in the soil 3. Photosynthesis is the process by which (1) the potential energy of simple sugars is transferred to ATP molecules (2) simple sugars are gradually broken down to form lactic acid or alcohol (3) two simple sugar molecules combine to form maltose and water (4) light energy is converted into the chemical energy of simple sugars EXIT TICKET After the lesson, now I understand… ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Something I still need help with… ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 3 ANSWERS 1. What kinds of organisms perform photosynthesis? Big Idea 1: Photosynthesis is performed by autotrophs 2. What are the reactants and the products of photosynthesis? Big Idea 2: In photosynthesis, light energy is converted to stored chemical energy when autotrophs convert carbon dioxide and water into sugar and released oxgyen. 3. How is energy converted and stored in the process of photosynthesis? Big Idea 2: In photosynthesis, light energy is converted to stored chemical energy when autotrophs convert carbon dioxide and water into sugar and released oxgyen. 4. What kinds of organisms perform cellular respiration? Big Idea 3: Cellular respiration occurs in all living organisms 5. What are the reactants and products of cellular respiration? Big Idea 4: In cellular respiration, sugar (glucose) and oxygen molecules are broken down into carbon dioxide and water, and energy is transferred and stored in a form of energy cells can use. 6. How is energy converted and stored in the process of cellular respiration? Big Idea 4: In cellular respiration, sugar (glucose) and oxygen molecules are broken down into carbon dioxide and water, and energy is transferred and stored in a form of energy cells can use. 7. How are the reactants and products of photosynthesis and cellular respiration related? Big Idea 5: The process of photosynthesis and cellular respiration form a cycle. 4
