Photosynthesis: Light and Dark Reactions - Numerical Applications
Q. How many molecules of ATP are produced in the light-dependent reactions for each molecule of glucose synthesized?
Solution
A total of 18 ATP molecules are produced for each glucose molecule synthesized.
Correct Answer: A — 18
Q. How many molecules of ATP are produced in the light-dependent reactions for every molecule of glucose synthesized?
Solution
A total of 36 ATP molecules are produced in the light-dependent reactions for every glucose molecule synthesized.
Correct Answer: C — 36
Q. How many molecules of carbon dioxide are required to produce one molecule of glucose in the Calvin cycle?
Solution
Six molecules of carbon dioxide are required to produce one molecule of glucose in the Calvin cycle.
Correct Answer: D — 6
Q. In the absence of light, which process will cease in plants?
-
A.
Photosynthesis
-
B.
Respiration
-
C.
Transpiration
-
D.
Glycolysis
Solution
Photosynthesis will cease in the absence of light, as it relies on light energy.
Correct Answer: A — Photosynthesis
Q. In the light reactions of photosynthesis, which molecule is produced as a byproduct?
-
A.
Glucose
-
B.
Oxygen
-
C.
NADPH
-
D.
ATP
Solution
Oxygen is produced as a byproduct during the light reactions of photosynthesis.
Correct Answer: B — Oxygen
Q. What is the effect of increased light intensity on the rate of photosynthesis, assuming other factors are optimal?
-
A.
Decreases rate
-
B.
Increases rate
-
C.
No effect
-
D.
Stops photosynthesis
Solution
Increased light intensity generally increases the rate of photosynthesis, up to a certain point.
Correct Answer: B — Increases rate
Q. What is the effect of increased light intensity on the rate of photosynthesis, assuming other factors are constant?
-
A.
Decreases rate
-
B.
Increases rate
-
C.
No effect
-
D.
Stops photosynthesis
Solution
Increased light intensity generally increases the rate of photosynthesis, up to a certain point.
Correct Answer: B — Increases rate
Q. What is the main energy carrier produced during the light reactions?
-
A.
NADPH
-
B.
ATP
-
C.
FADH2
-
D.
Glucose
Solution
ATP is the main energy carrier produced during the light reactions of photosynthesis.
Correct Answer: B — ATP
Q. What is the main function of the enzyme RuBisCO in photosynthesis?
-
A.
Fixing carbon dioxide
-
B.
Producing ATP
-
C.
Splitting water
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D.
Generating NADPH
Solution
RuBisCO is responsible for fixing carbon dioxide in the Calvin cycle.
Correct Answer: A — Fixing carbon dioxide
Q. What is the main product of the light-dependent reactions of photosynthesis?
-
A.
Glucose
-
B.
Oxygen
-
C.
NADPH
-
D.
ATP
Solution
Oxygen is released as a byproduct of the light-dependent reactions.
Correct Answer: B — Oxygen
Q. What is the primary function of the Calvin cycle?
-
A.
Convert light energy to chemical energy
-
B.
Fix carbon dioxide into organic molecules
-
C.
Produce oxygen
-
D.
Generate ATP
Solution
The primary function of the Calvin cycle is to fix carbon dioxide into organic molecules.
Correct Answer: B — Fix carbon dioxide into organic molecules
Q. What is the role of water in the light-dependent reactions?
-
A.
Source of carbon
-
B.
Electron donor
-
C.
Energy storage
-
D.
Oxygen production
Solution
Water acts as an electron donor in the light-dependent reactions, leading to the production of oxygen.
Correct Answer: B — Electron donor
Q. What is the significance of the electron transport chain in photosynthesis?
-
A.
Produces glucose
-
B.
Generates ATP and NADPH
-
C.
Fixes carbon dioxide
-
D.
Releases oxygen
Solution
The electron transport chain generates ATP and NADPH, which are essential for the Calvin cycle.
Correct Answer: B — Generates ATP and NADPH
Q. What is the significance of the proton gradient created during the light-dependent reactions?
-
A.
Drives ATP synthesis
-
B.
Fixes carbon
-
C.
Produces glucose
-
D.
Generates oxygen
Solution
The proton gradient drives ATP synthesis through ATP synthase.
Correct Answer: A — Drives ATP synthesis
Q. Which molecule is produced during the Calvin cycle in the dark reactions?
-
A.
NADPH
-
B.
ATP
-
C.
Glucose
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D.
Oxygen
Solution
Glucose is produced during the Calvin cycle, which is part of the dark reactions.
Correct Answer: C — Glucose
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