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Mitochondria

Plant Cell. Mitochondria. organelles where cellular respiration occurs. Respiration of Germinating Seeds. 012-10975 r1.04. Respiration of Germinating Seeds. Introduction. Each page of this lab that contains the symbol

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Mitochondria

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  1. Plant Cell Mitochondria organelles where cellular respiration occurs Respiration of Germinating Seeds 012-10975 r1.04

  2. Respiration of Germinating Seeds Introduction 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. Journals and Snapshots 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. Note: You may want to take a snapshot of the first page of this lab as a cover page for your journal.

  3. Respiration of Germinating Seeds Lab Challenge When plant seeds carry out "cellular respiration" they produce carbon dioxide. • Does temperature affect the rate at which seeds produce carbon dioxide (CO2)? • Do dormant seeds or geminating seeds produce more CO2?

  4. Respiration of Germinating Seeds Background • All living organisms need energy to survive, grow, and reproduce. • Organisms get their energy in the form of ATP (Adenosine Triphosphate), a small molecule packed with energy. • Organisms convert sugars and other macromolecules into ATP molecules through a process called cellular respiration.

  5. Respiration of Germinating Seeds Self-Check • What is the main function of ATP in living organisms? • respiration • triphosphate • motion • energy This image is a reminder to tap to take a snapshot of the page after you have entered your response.

  6. Respiration of Germinating Seeds ...Background • The chemical reaction for cellular respiration is: • C6H12O6 + 6O2 ----> 6CO2 + 6H2O + Energy (ATP molecules) • CO2is a measurable end product of the reaction. • The amount of CO2 created indicates the rate of • cellular respiration occurring inside an organism. • The process of cellular respiration occurs in the • mitochondria of all eukaryotic cells.

  7. Respiration of Germinating Seeds Self-Check • Why does this lab involve measuring the amount CO2 produced by seeds? • indicates rate of velocity • indicates rate of mortgage interest • indicates rate of cellular respiration • indicates heart-rate

  8. Respiration of Germinating Seeds Pre Lab Set Up (Your teacher may have already completed these steps for you) • 24 hours prior to the lab: • Place 20 dry seeds in a beaker and fill the beaker with tap water. • Put the beaker in a dark location for 24 hours. The seeds will begin to germinate. • 30 minutes prior to the lab: • Place half of the germinating seeds into an ice water bath. • Allow them to cool before starting the experiment.

  9. Respiration of Germinating Seeds Safety • Use all standard laboratory safety procedures. • DO NOT allow the Carbon Dioxide Gas Sensor to get wet.

  10. Respiration of Germinating Seeds Materials and Equipment Collect all of these materials before beginning the lab. • PASPORT Carbon Dioxide Gas Sensor • PASPORT Extension cable • Sampling bottle (included with sensor) • 1 Beaker (1000 mL) • 10 dry seeds • Ice (cubes or crushed) • Paper towels • Tap water • 10 germinating seeds at room temperature • 10 germinating seeds in ice water CO2 Gas Sensor PASPORT Extension Cable

  11. Respiration of Germinating Seeds Sequencing Challenge 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. A.Analyze the data. B. Measure the CO2 produced by dormant seeds. C. Measure the CO2 produced by germinating seeds. D.Measure the CO2 produced by cold seeds.

  12. Respiration of Germinating Seeds Setup: Dormant Seeds Q1: Why is it important to firmly insert the sensor into the bottle and create a seal? • Connect a PASPORT extension cable to the SPARK Science Learning System. Plug the CO2 Gas Sensor in the cable and then press the green button on the sensor to calibrate it. • Place 10 dormant (dry) seeds into the sampling bottle. • Put the end of the CO2 Gas Sensor into the sampling bottle. Firmly plug the end of the sampling bottle with the rubber stopper. Do not let the bottle tip over!

  13. Respiration of Germinating Seeds Q2:What will happen to the carbon dioxide level inside the bottle? Draw your prediction in the graph.* *To Draw a Prediction: 1. Tap to open the tool palette. 2. Tap then use your finger to draw your prediction. 3. Tap when finished. 4. If you make a mistake, tap to clear your prediction.

  14. Respiration of Germinating Seeds Collect Data: Dormant Seeds Q3: Why do you need to rinse out the sample bottle? • Note: Avoid jarring the sample bottle during data collection, as this can cause erratic results. • Tap to begin collecting data. • Record data for 10 minutes, then tap to end data collection. • Remove the sensor and the dormant (dry) seeds from the sample bottle. • Rinse the sample bottle out with tap water. • Continue to the next page.

  15. Respiration of Germinating Seeds Q4: What happened to the amount of CO2 produced by the dry seeds over time?

  16. Respiration of Germinating Seeds Q5: What will happen to the CO2 level when germinating seeds are placed in the bottle? Draw your prediction in the graph.* *To Draw a Prediction: 1. Tap to open the tool palette. 2. Tap then use your finger to draw your prediction. 3. Tap when finished. 4. If you make a mistake, tap to clear your prediction.

  17. Respiration of Germinating Seeds Collect Data: Room-Temp Seeds • Place ten of the room-temperature germinating seeds into the sample bottle. • Re-insert the sensor into the bottle. • Tap to begin collecting data. • Record data for 10 minutes, then tap to end data collection. • Remove the sensor and the dormant (dry) seeds from the sample bottle. • Rinse the sample bottle out with tap water.

  18. Respiration of Germinating Seeds Q6: What happened to the amount of CO2 produced by the germinating seeds over time?

  19. Respiration of Germinating Seeds Q7: How did your predicted graph line compare with the actual line?

  20. Respiration of Germinating Seeds Q8: What will happen to the CO2 level when germinating seeds are placed in the bottle? Draw your prediction in the graph.* *To Draw a Prediction: 1. Tap to open the tool palette. 2. Tap then use your finger to draw your prediction. 3. Tap when finished. 4. If you make a mistake, tap to clear your prediction.

  21. Respiration of Germinating Seeds Collect Data: Chilled Seeds • Fill the 1000 mL beaker with ice and water. • Place ten of the chilled germinating seeds into the sample bottle. Place the bottle into the icy beaker so the seeds stay cold! • 3. Re-insert the sensor into the bottle. • Tap to begin collecting data. • Record data for 10 minutes, then tap to end data collection. • Remove the sensor and the chilled seeds from the sample bottle. • Rinse the sample bottle out with tap water.

  22. Respiration of Germinating Seeds Q9: What happened to the amount of CO2 produced by the chilled germinating seeds over time?

  23. Respiration of Germinating Seeds Q10: How did your predicted graph line compare with the actual line?

  24. Respiration of Germinating Seeds Data Analysis • Determine the change in CO2 concentration for all runs, and record the information in the data table on the next page. • * To Find the Difference Between Two Data Points: • Tap to open the tools palette. • Tap and then tap two points on the data run. • Adjust using both buttons and then tap • Tap to display the differences.

  25. Respiration of Germinating Seeds Data Analysis • Record the initial, final, and change in CO2 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.

  26. Respiration of Germinating Seeds Analysis • How does the rate of CO2 production for dormant seeds compare to the rate of CO2 production for room-temperature germinating seeds? What does this information indicate?

  27. Respiration of Germinating Seeds Analysis • How does the rate of CO2 production for room-temperature geminating seeds compare to the rate of CO2 production for chilled germinating seeds? What does this information indicate?

  28. Respiration of Germinating Seeds Analysis • How did your predictions compare to the actual data collected? What did you learn?

  29. Respiration of Germinating Seeds Synthesis • If cellular respiration occurs during seed germination, what would happen to CO2 levels if you added water to a sample bottle filled with dry peas?

  30. Respiration of Germinating Seeds Synthesis • What is the chemical equation for cellular respiration? Where does this process occur in the cell?

  31. Respiration of Germinating Seeds Synthesis • What gaseous molecule is released during cellular respiration?

  32. Respiration of Germinating Seeds Synthesis • Explain why plants need to perform cellular respiration even though they are photosynthetic.

  33. Respiration of Germinating Seeds Synthesis • What environmental factors can affect the rate of cellular respiration in an organism?

  34. Respiration of Germinating Seeds Multiple Choice • Cellular respiration takes place in what part of the cell? • chloroplasts • nuclei • lysosomes • mitochondria

  35. Respiration of Germinating Seeds Multiple Choice • In cells, the energy stored in glucose is used to make what energy rich compound? • water • ATP • ADP • DNA

  36. Respiration of Germinating Seeds 5-10 minutes 180-240 seconds 1200-1800 seconds 25-30 minutes Multiple Choice • According to the graph, the rate of CO2 production was highest at what time?

  37. Respiration of Germinating Seeds Congratulations! You have completed the lab. Please remember to follow your teacher's instructions for cleaning-up and submitting your lab.

  38. Respiration of Germinating Seeds References Images are taken from PASCO documentation, public domain clip art, or Wikimedia Foundation Commons. http://www.openstockphotography.org/image-licensing/cell-biology/Plant_cell_structure.png http://commons.wikimedia.org/wiki/File:CDC_limabean.jpg http://commons.wikimedia.org/wiki/File:ATP-3D-sticks-rotate90.png http://commons.wikimedia.org/wiki/File:Diagram_of_an_animal_mitochondrion.svg http://commons.wikimedia.org/wiki/File:Soda_bubbles_macro.jpg http://commons.wikimedia.org/wiki/File:Pro-Atomo.gif http://commons.wikimedia.org/wiki/File:Mitochondria,_mammalian_lung_-_TEM.jpg

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