Photosynthesis: Light and Dark Reactions - Competitive Exam Level
Q. In which phase of photosynthesis is ATP synthesized?
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A.
Light-dependent reactions
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B.
Calvin cycle
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C.
Both A and B
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D.
None of the above
Solution
ATP is synthesized during the light-dependent reactions of photosynthesis.
Correct Answer: A — Light-dependent reactions
Q. What is the role of RuBisCO in photosynthesis?
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A.
To absorb light
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B.
To fix carbon dioxide
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C.
To produce ATP
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D.
To transport electrons
Solution
RuBisCO is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: B — To fix carbon dioxide
Q. What is the significance of the light-harvesting complexes?
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A.
To synthesize glucose
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B.
To absorb and transfer light energy
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C.
To produce oxygen
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D.
To fix carbon dioxide
Solution
Light-harvesting complexes absorb and transfer light energy to the reaction center.
Correct Answer: B — To absorb and transfer light energy
Q. Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?
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A.
Rubisco
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B.
ATP synthase
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C.
NADP+ reductase
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D.
Phosphofructokinase
Solution
Rubisco is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: A — Rubisco
Q. Which of the following statements about the dark reactions is true?
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A.
They require light directly
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B.
They occur in the stroma
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C.
They produce oxygen
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D.
They are independent of temperature
Solution
The dark reactions, or Calvin cycle, occur in the stroma of the chloroplast and do not require light directly.
Correct Answer: B — They occur in the stroma
Q. Which process occurs in the dark reactions of photosynthesis?
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A.
Photolysis of water
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B.
Carbon fixation
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C.
Light absorption
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D.
Electron transport chain
Solution
Carbon fixation occurs during the dark reactions of photosynthesis.
Correct Answer: B — Carbon fixation
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