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-212651-43859LIVING ENVIRONMENT LAB 22Name: __________________________ Period: 2(BD), 2(AC), 8(AC) Instructor: LathropPhotosynthesis vs. Cell RespirationSCO _________RE 20LIVING ENVIRONMENT LAB 22Name: __________________________ Period: 2(BD), 2(AC), 8(AC) Instructor: LathropPhotosynthesis vs. Cell RespirationSCO _________RE 20ProblemHow are photosynthesis and cellular respiration related? Introduction445548510781700All organisms need energy to grow and develop. Plants are able to convert light energy into energy stored within the bonds of sugars during photosynthesis. Plants use the sugars to build complex carbohydrates. These compounds are stored until they are needed to provide energy for other reactions. The process used by both plants and animals to extract energy from compounds is cellular respiration.In this virtual lab, you will use closed systems to investigate reactions that take place during photosynthesis and cellular respiration. A closed system is one that keeps materials from entering or leaving. One system will have aquatic snails, one will have an aquatic plant and one will have both a snail and aquatic plant. You will observe how the amount of light affects the reactions in each system.Directions: Drag the following substances to the correct locations, on the diagram below, to show the biochemical pathways between photosynthesis and cell respiration. 535876582550Sunlight00Sunlight456909182550Oxygen00Oxygen391142382550Water00Water289628082550Chloroplast00Chloroplast180119982550Mitochondria00Mitochondria105207782550Glucose00Glucose615569082225ATP00ATP40394883156CO200CO22781300338645500Type the summary equation for photosynthesis:275272546990056032407556504200525755650158115075565046672675565026193758128027527251346200 + + Type the summary equation for Cell Respiration:15335252457450024193503990975241935051536602457450622363524193502581275895350 + + + 244792516510PROCEDURE:Log onto Choose Virtual Labs then choose Carbon Transfer through Snails and ElodeaBACKGROUND:All organisms are dependent on a healthy CO2 – O2 balance. Photosynthesis and cellular respiration are key processes in maintaining this balance, Plants, through the process of photosynthesis, use energy absorbed from sunlight, water, and carbon dioxide to produce carbohydrates and oxygen. Animals and plants, through the process of cellular respiration. Use oxygen and sugars to produce carbon dioxide, water and the energy needed to maintain life, ATP. PROBLEM:You are setting up a small aquarium at home. Your aquarium kit contains a bag of snail eggs on an elodea plant. The instructions say to pour the contents including the elodea into the aquarium, but you are not sure why you need the elodea plant. Why might elodea plants be important in maintaining a healthy aquarium ecosystem?In this investigation, you will use snails and elodea to explore a biological system. You will form a hypothesis about the relationship between snails and elodea, and then design an experiment to test your hypothesis. EXPLORE the lab to learn what is available for your investigation. You must click on each item in the checklist and complete the table below. Once the table is completed click PROCEDURE. ItemDescription or useBeaker of Bromthymol Blue BTB SolutionPond SnailsElodeaTest TubesGrow LightTest Tube Rack CoverCO2-O2 Cycle PosterColor KeyInvestigation Procedure:Step 1:Open the Lab Notebook and write a hypothesis to explain how carbon dioxide cycles in an aquarium water through snails and Elodea. Review the Background information or the poster if you need help with your hypothesis.Once you have typed your hypothesis in the Lab Notebook, copy and paste your hypothesis in the textbox below. Then, click the arrow to advance to step 2. Copy your hypothesis from the lab notebook here:127591523060Step 2: Open the Lab Notebook and design an experiment to test your hypothesis. You will begin your experimental design by establishing your variables and control.Once you have typed your answers to the questions in the Lab Notebook, copy and paste your answers in the textboxes below.Then, click the arrow to advance to step 3.In my experiment, I will measure the level of CO2 by:127591974210In my experiment, my independent variable will be:127591602810The setup for my control condition is:127591763030You have a total of 8 test tubes available for your experiment. Choose 7 test tubes. Determine the Set-up for each test tube.Tube 1 (Control) - Tube 2 – Tube 3 – Tube 4 – Tube 1 (Control) - Tube 2 – Tube 3 – Tube 4 – Step 3: Drag the test tubes to the test tube racks. Fill each tube with BTB. Step 4: Add the snails and Elodea plants to the desired test tubes. Complete the chart for your predictions: Type only your Predicted End Color. Test TubesContentsStarting colorPredicted End ColorEnd ColorTested in the Light10 snails, 0 ElodeaGreen22 snails, 0 ElodeaGreen30 snails, 1 ElodeaGreen42 snails, 1 ElodeaGreenTested in the Dark10 snails, 0 ElodeaGreen22 snails, 0 ElodeaGreen30 snails, 1 ElodeaGreen42 snails, 1 ElodeaGreenStep 5: Check set-up and add stoppersDrag one test tube rack to grow light and the other cover with the dark box.Start clock then go to step 6.Step 6: Open Lab Notebook and record END COLORS. Also record in the table above.Advance to step 7. Step 7: You do not need to open the Lab Notebook again. Type your answers to the conclusion questions below: Conclusion Questions:Conclude: What was your experimental design? What is the relationship between snails and Elodea in terms of energy processes and gas production?Analyze: Why did the color of the Bromthymol Blue change?Analyze: What was the importance of a control in your experiment? What would you conclude if the color of the control solution changed?Infer: When you began your experiment, was there CO2 in the water? In the test tubes that contained Elodea, where did the CO2 go?Infer: Which gas did the snails release? What observation supports this inference?Apply: Based on the results of your experiment, explain why you need to add the Elodea to your snail aquarium. Study the simple diagram below and answer the questions: The container contains a fish and a plant. The fish does not eat the plant, but is provided fish food.207334910456800What substance(s) will be given off by the aquatic plant?What substance(s) will be given off by the fish?What biochemical energy reaction(s) will occur in the fish?What biochemical energy reaction(s) will occur in the plant?What additional source of energy must be provided so both the fish and plant maintain homeostasis?Why are photosynthesis and cellular respiration viewed as complementary processes? ................
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