Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 7, Problem 1AC
Suppose an experiment is performed in which plant I is supplied with normal carbon dioxide but with water that contains radioactive oxygen atoms. Plant II is supplied with normal water but with carbon dioxide that contains radioactive oxygen atoms. Each plant is allowed to perform photosynthesis, and the oxygen gas and sugars produced are tested for radioactivity. Which plant would you expect to produce radioactive sugars, and which plant would you expect to produce radioactive oxygen gas? Explain why.
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An experiment was done to determine how color of light and distance affects photosynthetic activity of the pond weed. Pond weed was placed in a test tube containing a solution of sodium hydrogen carbonate, and had its end cut; light was placed 50 cm away and four colors were tested (clear, red, blue, and green). After placing the light, the pondweed was given a certain amount of time to adjust before counting the bubbles, bubbles were counted for 1, 3, and 5 minutes. Only the bubbles that came out of the cut end was counted to represent the rate of photosynthesis.
Below is the tabulated results. What are the possible factors or errors that could have affected clear/white light to have lower photosynthetic activity? In theory this should have the highest rate.
In 1770, Joseph Priestley performed a series of experiments to determine the
reactants and products of photosynthesis. The diagram below shows the
experimental conditions and results of two experiments performed by Priestley,
named here as Experiment 1 and Experiment 2. From his experiments, Priestley
concluded that plants restore to the air whatever breathing animals and candles
remove.
Joseph Priestly Photosynthesis Experiments and Results
Experiment
Results:
- candle extinguished (went out)
1
- mouse died
Experiment
2
Results:
candle continued to burn
mouse stayed alive
Note: Experiment 1 and Experiment 2 were both performed in the presence of
sunlight.
The substance produced by the plant in Experiment 2, that keeps the candle
burning and the mouse alive is
O CO2
O 02
O H2O
O C6H1206
How would you design an experiment to test the following hypothesis:
" The optimal temperature for photosynthesis in spinach leaves is 20 degrees Celsius?"
Chapter 7 Solutions
Biology
Ch. 7.1 - What chemical reactions allow plants to capture...Ch. 7.1 - explain why photosynthesis is important?Ch. 7.1 - diagram the structure of leaves and chloroplasts...Ch. 7.1 - write out and explain the basic equation for...Ch. 7.1 - summarize the main events of the light reactions...Ch. 7.2 - You continuously monitor the photosynthetic oxygen...Ch. 7.2 - Prob. 1HYEWCh. 7.2 - What reactions allow plants to store the...Ch. 7.2 - list the light capturing molecules in chloroplasts...Ch. 7.2 - diagram and describe the molecules within the...
Ch. 7.2 - Prob. 3CYLCh. 7.3 - Prob. 1TCCh. 7.3 - describe the function of the Calvin cycle and...Ch. 7.3 - list the three stages of the Calvin cycle,...Ch. 7.3 - describe the fate of the simple sugar G3P...Ch. 7.3 - Prob. 2TCCh. 7.3 - What global policy changes and what individual...Ch. 7 - Which of the following is True? a. Photosynthesis...Ch. 7 - The Calvin cycle a. can only occur when light is...Ch. 7 - Prob. 3MCCh. 7 - Prob. 4MCCh. 7 - Which of the following is False? a. Photosystem II...Ch. 7 - Prob. 1FIBCh. 7 - Chlorophyll a captures wavelengths of light that...Ch. 7 - Prob. 3FIBCh. 7 - Prob. 4FIBCh. 7 - Light reactions generate the energy-carrier...Ch. 7 - Explain what would happen to life if...Ch. 7 - Prob. 2RQCh. 7 - Draw a simplified diagram of a leaf cross-section...Ch. 7 - Draw a simplified diagram of a chloroplast and...Ch. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Suppose an experiment is performed in which plant...Ch. 7 - Prob. 2ACCh. 7 - Assume you want to add an accessory pigment to the...
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