Photosynthesis: Light and Dark Reactions - Real World Applications
Q. How do plants adapt their photosynthesis process in low light conditions?
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A.
Increase chlorophyll production
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B.
Decrease water usage
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C.
Reduce carbon fixation
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D.
Increase respiration rate
Solution
Plants may increase chlorophyll production to enhance light absorption in low light conditions.
Correct Answer: A — Increase chlorophyll production
Q. How do plants adapt to low light conditions in terms of photosynthesis?
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A.
Increasing chlorophyll concentration
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B.
Decreasing leaf area
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C.
Reducing water uptake
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D.
Increasing respiration rate
Solution
Plants adapt to low light conditions by increasing chlorophyll concentration to capture more light.
Correct Answer: A — Increasing chlorophyll concentration
Q. How do plants utilize the products of the light reactions?
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A.
For cellular respiration only
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B.
To synthesize proteins
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C.
To fuel the dark reactions
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D.
To produce more chlorophyll
Solution
Plants use ATP and NADPH produced in the light reactions to fuel the dark reactions (Calvin cycle).
Correct Answer: C — To fuel the dark reactions
Q. How does increased carbon dioxide concentration affect photosynthesis?
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A.
Decreases rate
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B.
Increases rate
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C.
No effect
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D.
Inhibits light reactions
Solution
Increased carbon dioxide concentration generally increases the rate of photosynthesis up to a point.
Correct Answer: B — Increases rate
Q. What is photophosphorylation?
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A.
Synthesis of glucose
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B.
Production of ATP using light energy
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C.
Conversion of NADP+ to NADPH
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D.
Splitting of water molecules
Solution
Photophosphorylation is the process of producing ATP using light energy during photosynthesis.
Correct Answer: B — Production of ATP using light energy
Q. What is the main enzyme involved in the carbon fixation process during the dark reactions?
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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 main enzyme that catalyzes the fixation of carbon dioxide in the dark reactions.
Correct Answer: A — RUBISCO
Q. What is the significance of the Calvin cycle in photosynthesis?
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A.
It produces ATP
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B.
It generates oxygen
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C.
It synthesizes glucose
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D.
It captures light energy
Solution
The Calvin cycle synthesizes glucose from carbon dioxide using the energy from ATP and NADPH produced in the light reactions.
Correct Answer: C — It synthesizes glucose
Q. What role do accessory pigments play in photosynthesis?
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A.
They directly produce glucose
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B.
They capture additional light wavelengths
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C.
They release oxygen
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D.
They fix carbon dioxide
Solution
Accessory pigments capture additional light wavelengths, broadening the spectrum of light used for photosynthesis.
Correct Answer: B — They capture additional light wavelengths
Q. What role do C4 and CAM pathways play in photosynthesis?
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A.
They enhance light absorption
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B.
They reduce water loss
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C.
They increase oxygen production
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D.
They are types of light reactions
Solution
C4 and CAM pathways are adaptations that help plants reduce water loss during photosynthesis.
Correct Answer: B — They reduce water loss
Q. What role do C4 and CAM plants play in photosynthesis under arid conditions?
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A.
They increase water loss
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B.
They enhance carbon fixation efficiency
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C.
They reduce light absorption
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D.
They eliminate the need for light
Solution
C4 and CAM plants enhance carbon fixation efficiency to minimize water loss in arid conditions.
Correct Answer: B — They enhance carbon fixation efficiency
Q. Which environmental factor can limit the rate of photosynthesis?
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A.
Temperature
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B.
Soil pH
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C.
Wind speed
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D.
Humidity
Solution
Temperature can limit the rate of photosynthesis, as enzymes involved are temperature-sensitive.
Correct Answer: A — Temperature
Q. Which of the following is a real-world application of understanding photosynthesis?
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A.
Improving crop yields
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B.
Developing new pigments
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C.
Creating artificial light sources
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D.
Enhancing soil quality
Solution
Understanding photosynthesis can lead to methods for improving crop yields through better light utilization.
Correct Answer: A — Improving crop yields
Q. Which pigment is primarily responsible for capturing light energy during 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 captures light energy for photosynthesis.
Correct Answer: A — Chlorophyll a
Q. Which process occurs during the light reactions of photosynthesis?
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A.
Carbon fixation
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B.
Water splitting
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C.
Glucose synthesis
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D.
Oxygen uptake
Solution
Water splitting occurs during the light reactions, producing oxygen and electrons.
Correct Answer: B — Water splitting
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