Photosynthesis: Light and Dark Reactions - Problem Set
Q. During which phase of photosynthesis is carbon dioxide utilized?
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A.
Light reactions
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B.
Calvin cycle
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C.
Photorespiration
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D.
Electron transport chain
Solution
Carbon dioxide is utilized during the Calvin cycle.
Correct Answer: B — Calvin cycle
Q. In which phase of photosynthesis is glucose synthesized?
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A.
Light reactions
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B.
Calvin cycle
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C.
Photorespiration
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D.
Electron transport chain
Solution
Glucose is synthesized during the Calvin cycle, which occurs in the stroma of chloroplasts.
Correct Answer: B — Calvin cycle
Q. What is the function of RuBisCO in 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 generate NADPH
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D.
To release oxygen
Solution
RuBisCO catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: B — To fix carbon dioxide
Q. What is the main function of the light-harvesting complexes?
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A.
To transport electrons
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B.
To absorb and transfer light energy
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C.
To fix carbon
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D.
To produce glucose
Solution
Light-harvesting complexes absorb and transfer light energy to the reaction center.
Correct Answer: B — To absorb and transfer light energy
Q. What is the main function of the RuBisCO enzyme in photosynthesis?
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A.
To produce ATP
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B.
To fix carbon dioxide
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C.
To split water
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D.
To generate NADPH
Solution
RuBisCO catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: B — To fix carbon dioxide
Q. What is the main purpose of the light reactions in photosynthesis?
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A.
To produce glucose
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B.
To convert solar energy into chemical energy
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C.
To release carbon dioxide
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D.
To synthesize chlorophyll
Solution
The main purpose of the light reactions is to convert solar energy into chemical energy in the form of ATP and NADPH.
Correct Answer: B — To convert solar energy into chemical energy
Q. What is the role of ATP synthase in photosynthesis?
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A.
To absorb light
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B.
To fix carbon
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C.
To synthesize ATP
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D.
To transport electrons
Solution
ATP synthase synthesizes ATP from ADP and inorganic phosphate during the light reactions.
Correct Answer: C — To synthesize ATP
Q. What role does water play in the light reactions?
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A.
It absorbs light
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B.
It provides electrons
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C.
It fixes carbon
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D.
It produces glucose
Solution
Water provides electrons through the process of photolysis during the light reactions.
Correct Answer: B — It provides electrons
Q. Which of the following statements about the light reactions is true?
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A.
They occur in the stroma
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B.
They do not require light
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C.
They produce ATP and NADPH
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D.
They fix carbon dioxide
Solution
The light reactions produce ATP and NADPH, which are used in the Calvin cycle.
Correct Answer: C — They produce ATP and NADPH
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