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