Photosynthesis: Light and Dark Reactions - Case Studies
Q. In C4 plants, where does the initial carbon fixation occur?
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A.
In the mesophyll cells
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B.
In the bundle sheath cells
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C.
In the stroma
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D.
In the thylakoid membranes
Solution
In C4 plants, the initial carbon fixation occurs in the mesophyll cells.
Correct Answer: A — In the mesophyll cells
Q. In C4 plants, where does the initial fixation of CO2 occur?
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A.
In the mesophyll cells
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B.
In the bundle sheath cells
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C.
In the stroma
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D.
In the thylakoid membranes
Solution
In C4 plants, the initial fixation of CO2 occurs in the mesophyll cells before it is transferred to bundle sheath cells.
Correct Answer: A — In the mesophyll cells
Q. What is the end product of the Calvin cycle?
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A.
Oxygen
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B.
Glucose
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C.
NADPH
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D.
ATP
Solution
The end product of the Calvin cycle is glucose.
Correct Answer: B — Glucose
Q. What is the main function of the Calvin cycle?
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A.
To produce ATP
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B.
To fix carbon dioxide
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C.
To absorb light
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D.
To release oxygen
Solution
The main function of the Calvin cycle is to fix carbon dioxide into organic molecules.
Correct Answer: B — To fix carbon dioxide
Q. What is the role of water in the light reactions of photosynthesis?
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A.
Source of electrons
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B.
Source of carbon
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C.
Source of glucose
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D.
Source of oxygen
Solution
Water serves as the source of electrons in the light reactions.
Correct Answer: A — Source of electrons
Q. What is the role of water in the light reactions?
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A.
To provide electrons
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B.
To produce glucose
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C.
To absorb light
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D.
To fix carbon
Solution
Water provides electrons through photolysis during the light reactions.
Correct Answer: A — To provide electrons
Q. What role does RuBisCO play in photosynthesis?
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A.
It absorbs light
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B.
It fixes carbon dioxide
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C.
It produces ATP
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D.
It generates oxygen
Solution
RuBisCO is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: B — It fixes carbon dioxide
Q. Which of the following factors can affect the rate of photosynthesis?
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A.
Light intensity
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B.
Carbon dioxide concentration
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C.
Temperature
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D.
All of the above
Solution
All of the above factors can affect the rate of photosynthesis.
Correct Answer: D — All of the above
Q. Which of the following statements about the light-dependent reactions is true?
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A.
They occur in the stroma
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B.
They produce ATP and NADPH
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C.
They do not require light
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D.
They fix carbon dioxide
Solution
The light-dependent reactions produce ATP and NADPH.
Correct Answer: B — They produce ATP and NADPH
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