Lab Topics 7 & 8: Cellular Respiration & Photosynthesis (10 points possible)

1.  Briefly describe the importance (purpose) of cellular respiration in plants and animals. (1 point)

2.  What is one difference between cellular respiration and alcoholic fermentation? (1 point)

3.  Referring to Table 7.1 in your lab manual: Which of the three test tubes (1, 2 and 3) would you expect to produce carbon dioxide the fastest and why? (1 point)

4.  Referring to Exercise 7.2 in your lab manual: as the DCPIP solutions in that experiment turn from dark blue to clear, would you expect the transmittance reading on the spectrophotometer to increase or decrease? (1 point)

5.  Which process typically produces more ATP; cellular respiration or alcoholic fermentation? (1 point)

6. Briefly describe the importance (purpose) of photosynthesis in plants. (1 point)

7.  Referring to Exercise 8.1 in your lab manual: the production of what gas by the plant will cause the spinach leaf disks to start floating again? (1 point)

8.  Referring to Table 8.1 in your lab manual: assuming that all of the petri dishes started with the same number of sunken spinach leaf disks; after 20 minutes, which petri dish (dark conditions, just room light, direct (growing) lamp light) would you expect to have the most disks floating and why? (1 point)

9.  Why does the experiment in Exercise 8.1 call for the use of sodium bicarbonate water, and not just tap water? (1 point)

10.  Referring to Table 8.2 in your lab manual: which type (wavelength) of visible light (white, blue, yellow, green or red) appears to be the least effective in photosynthesis, and why do you think that is the case? (1 point)


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