1. Plant Respiration and Photosynthesis 012-10974 r1.04

2. The Snapshot button is used to capture the screen. The Journal is where snapshots are stored and viewed. The Share button is used to export or print your journal to turn in your work. Introduction Journals and Snapshots Plant Respiration and Photosynthesis Each page of this lab that contains the symbol should be inserted into your journal. After completing a lab page with the snapshot symbol, tap (in the upper right hand corner) to insert the page into your journal. Note: You may want to take a snapshot of the first page of this lab as a cover page for your journal.

3. Lab Challenge Do plants perform cellular respiration in addition to photosynthesis? Plant Respiration and Photosynthesis

4. Background Photosynthesis The process of photosynthesis occurs in the chloroplasts of plants. Light is necessary for the entire photosynthesis process to occur. The formula for photosynthesis is: 6CO 2 + 6H 2 O + LIGHT ENERGY ----> C 6 H 12 O 6 + 6O 2 Carbon dioxide, water, and light are required to produce glucose and oxygen. Plant Respiration and Photosynthesis

5. This image is a reminder to tap to take a snapshot of the page after you have entered your response. Self Check 1.If you were measuring carbon dioxide levels in a terrarium during photosynthesis, you would expect to see the levels ________. a)increase b)decrease c)stay the same Plant Respiration and Photosynthesis

6. ...Background Cellular Respiration The process of cellular respiration occurs in the mitochondria of ALL cells. Cellular respiration converts the glucose made by photosynthesis into ATP (adenosine triphosphate), which is the energy source that is usable by cells. The formula for cellular respiration is: C 6 H 12 O 6 + 6O 2 ----> 6CO 2 + 6H 2 O + Energy (ATP molecules) Glucose and oxygen produce carbon dioxide, water and ATP. Plant Respiration and Photosynthesis

7. Self Check 2.If carbon dioxide levels were being monitored inside a terrarium, you would expect to see an increase in CO 2 levels when the plants were in ___________. a)darkness b)light c)Canada Plant Respiration and Photosynthesis

8. Safety Follow all common lab safety procedures. Do not allow the CO 2 sensor to get wet! Plant Respiration and Photosynthesis

9. Materials and Equipment Collect all of these materials before beginning the lab. PASPORT CO 2 Gas Sensor Sensor extension cable Sampling bottle (included with the sensor) Large beaker or aquarium (to act as a heat sink) Box or heavy cloth Aluminum foil Lamp, 100-watt Mint plant Water, 1 L Plant Respiration and Photosynthesis

10. The steps to the left are part of the procedure for this lab activity. They are not in the right order. Determine the correct sequence of the steps, then take a snapshot of this page. Sequencing Challenge A. Cover the bottle with a box or cloth and record CO 2 production in the dark. B. Record CO 2 production when the plant is exposed to the light. C. Analyze the changes in CO 2 production in dark vs. light. D. Add several stems and leaves of a small plant into the sampling bottle. Plant Respiration and Photosynthesis

11. Setup: Darkness 1.Attach the Carbon Dioxide Gas Sensor to a sensor extension cable and connect it to the SPARK Science Learning System. 2.Add 25 mL of water to the sample bottle. 3.Gently push several stems of the plant into the sampling bottle. Try to arrange the leaves so that they are facing outward. 4.Calibrate the sensor by pushing and releasing the green button on the sensor. When the green light in the button begins flashing again, the sensor is calibrated. Plant Respiration and Photosynthesis

12. Prediction: General Q1: Why do you think that water is needed in the sample bottle? Plant Respiration and Photosynthesis

13. Q2: What do you think will happen to the CO 2 level in the bottle while the plant is in the dark? Explain why. Collect Data: Darkness 1.Place the CO 2 Gas Sensor firmly into the sampling bottle. 2.Carefully cover the sample bottle with a box or heavy cloth to block out any light. 3.Tap to begin data collection. 4.Record data for 10 minutes and then tap to stop data collection. Plant Respiration and Photosynthesis

15. Q2: What is the purpose of the aluminum foil? Q3: What is the purpose of the beaker/ aquarium full of water? Setup: Light 1.Remove the cloth or box from the sampling bottle and place the bottle on aluminum foil. 2.Place a large beaker of water or aquarium between the light source and the beaker. 3.Turn on the light source and wait 3 minutes to allow photosynthesis to begin. Plant Respiration and Photosynthesis

16. Q4: What do you think will happen to the CO 2 level in the bottle while the plant is in the light? Explain why. Collect Data: Light 1.Tap to begin data collection. 2.Record data for 10 minutes and then tap to stop data collection. Plant Respiration and Photosynthesis

17. Data Analysis Plant Respiration and Photosynthesis 1.Determine the change in CO 2 concentration for both runs, and record the information in the data table on the next page. * To Find the Difference Between Two Data Points: 1.Tap to open the tools palette. 2.Tap and then tap two points on the data run. 3.Adjust using both buttons and then tap 4.Tap to display the differences.

18. Data Analysis 2. Record the initial, final, and change in CO 2 concentration for all runs, in the data table to the left. *To Enter Data into a Table: 1.Tap to open the tool palette. 2.Tap then tap a cell in the data table to highlight it in yellow. 3.Tap to open the Keyboard screen. Plant Respiration and Photosynthesis

19. Analysis 1.What happens to the level of carbon dioxide gas when the plant is in the darkness? Why does this happen? Plant Respiration and Photosynthesis

20. 2.What happens to the level of carbon dioxide gas when the plant is in bright light? Why does this happen? Plant Respiration and Photosynthesis Analysis

21. 3.Was there greater change in the level of carbon dioxide in the darkness or light? Explain. Plant Respiration and Photosynthesis Analysis

22. Synthesis 1.What part of the activity shows the effect of cellular respiration on carbon dioxide levels in the chamber? Plant Respiration and Photosynthesis

23. 2.What is meant by the term "Carbon Cycle" in this activity? Plant Respiration and Photosynthesis Synthesis

24. 3.Explain how photosynthesis and cellular respiration are dependent on one another. Plant Respiration and Photosynthesis Synthesis

25. 4.If plants are able to photosynthesize, why do they also have to go through cellular respiration? Plant Respiration and Photosynthesis Synthesis

26. 5.Write a conclusion for this experiment based on the following question, "Does the level of carbon dioxide gas produced in a closed environment change in dark and in bright light conditions?" Plant Respiration and Photosynthesis Synthesis

27. Multiple Choice 1.Which of the following are required for photosynthesis to occur? a)light b)chloroplasts c)carbon dioxide d)all of the above Plant Respiration and Photosynthesis

28. Multiple Choice 2.Respiration can occur in a plant ____________. a)in the light b)in the dark c)when oxygen is present d)all of the above Plant Respiration and Photosynthesis

29. Multiple Choice 3.When a bright light is turned on a plant, which reaction(s) take place? a)photosynthesis only b)cellular respiration only c)photosynthesis and cellular respiration d)nothing Plant Respiration and Photosynthesis

30. a)respiration then photosynthesis b)photosynthesis then respiration c)light-dependent reactions only d)light-independent reactions only Multiple Choice 4. What is shown in the graph of CO 2 concentration vs. Time for a plant? Plant Respiration and Photosynthesis

31. You have completed the lab. Congratulations! Please remember to follow your teacher's instructions for cleaning-up and submitting your lab. Plant Respiration and Photosynthesis

32. Images are taken from PASCO documentation, public domain clip art, or Wikimedia Foundation Commons http://commons.wikimedia.org/wiki/File:Narzisse.jpg http://commons.wikimedia.org/wiki/File:Peppermint_and_Corsican_mint_plant.jpg http://commons.wikimedia.org/wiki/File:Rose_Geranium.jpg http://commons.wikimedia.org/wiki/File:Sunflowers.jpg References Plant Respiration and Photosynthesis