Photosynthesis: Light and Dark Reactions
Q. During which phase of photosynthesis is carbon dioxide incorporated into organic molecules?
-
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 incorporated into organic molecules during the Calvin cycle.
Correct Answer: B — Calvin cycle
Q. In which part of the chloroplast do the light reactions of photosynthesis occur?
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A.
Stroma
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B.
Thylakoid membranes
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C.
Cytoplasm
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D.
Outer membrane
Solution
The light reactions occur in the thylakoid membranes of the chloroplast.
Correct Answer: B — Thylakoid membranes
Q. In which phase of photosynthesis is carbon dioxide utilized?
-
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 in the Calvin cycle during photosynthesis.
Correct Answer: B — Calvin cycle
Q. What is produced during the light reactions of photosynthesis?
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A.
Glucose
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B.
Oxygen
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C.
NADPH
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D.
Both Oxygen and NADPH
Solution
Both oxygen and NADPH are produced during the light reactions.
Correct Answer: D — Both Oxygen and NADPH
Q. What is the main energy currency produced during the light reactions?
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A.
NADPH
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B.
FADH2
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C.
ATP
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D.
Glucose
Solution
ATP is the main energy currency produced during the light reactions of photosynthesis.
Correct Answer: C — ATP
Q. What is the main function of the light reactions in photosynthesis?
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A.
To produce glucose
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B.
To convert light energy into chemical energy
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C.
To release carbon dioxide
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D.
To absorb water
Solution
The main function of the light reactions is to convert light energy into chemical energy in the form of ATP and NADPH.
Correct Answer: B — To convert light energy into chemical energy
Q. What is the main function of the light reactions?
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A.
To produce glucose
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B.
To convert solar energy to chemical energy
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C.
To release carbon dioxide
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D.
To synthesize proteins
Solution
The main function 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 to chemical energy
Q. What is the main function of the thylakoid membrane?
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A.
Storage of glucose
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B.
Light absorption
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C.
Carbon fixation
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D.
Water splitting
Solution
The thylakoid membrane's main function is to absorb light energy for photosynthesis.
Correct Answer: B — Light absorption
Q. What is the primary pigment involved in photosynthesis?
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A.
Chlorophyll a
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B.
Carotenoids
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C.
Xanthophylls
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D.
Chlorophyll b
Solution
Chlorophyll a is the main pigment that absorbs light energy for photosynthesis.
Correct Answer: A — Chlorophyll a
Q. What role does water play in the light reactions of photosynthesis?
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A.
Source of carbon
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B.
Source of electrons
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C.
Source of ATP
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D.
Source of glucose
Solution
Water acts as a source of electrons in the light reactions, which are used to replace those lost by chlorophyll.
Correct Answer: B — Source of electrons
Q. Which enzyme is responsible for carbon fixation 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 enzyme is responsible for fixing 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 gas is a byproduct of the light reactions?
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A.
Carbon dioxide
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B.
Nitrogen
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C.
Oxygen
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D.
Methane
Solution
Oxygen is released as a byproduct of the light reactions of photosynthesis.
Correct Answer: C — Oxygen
Q. Which molecule acts as an electron carrier in the light reactions?
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A.
ATP
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B.
NADPH
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C.
FADH2
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D.
RuBP
Solution
NADPH acts as an electron carrier in the light reactions.
Correct Answer: B — NADPH
Q. Which molecule acts as the primary energy carrier in the dark reactions?
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A.
ATP
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B.
NADPH
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C.
Glucose
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D.
RuBP
Solution
ATP is the primary energy carrier used in the dark reactions (Calvin cycle).
Correct Answer: A — ATP
Q. Which molecule acts as the primary energy carrier in the light reactions?
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A.
ATP
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B.
NADPH
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C.
Glucose
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D.
RuBP
Solution
ATP is the primary energy carrier produced during the light reactions.
Correct Answer: A — ATP
Q. Which of the following is NOT a product of the light-dependent reactions?
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A.
ATP
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B.
NADPH
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C.
Oxygen
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D.
Glucose
Solution
Glucose is not produced in the light-dependent reactions; it is produced in the Calvin cycle.
Correct Answer: D — Glucose
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