Plant Physiology - Photosynthesis
Q. What is the function of NADP+ in photosynthesis? (2019)
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A.
Energy storage
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B.
Electron carrier
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C.
Carbon fixation
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D.
Light absorption
Solution
NADP+ acts as an electron carrier, becoming NADPH during the light-dependent reactions.
Correct Answer: B — Electron carrier
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Q. What is the function of stomata in plants? (2019)
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A.
Water absorption
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B.
Gas exchange
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C.
Nutrient uptake
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D.
Photosynthesis
Solution
Stomata are small openings on leaves that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer: B — Gas exchange
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Q. What is the primary source of energy for photosynthesis? (2023)
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A.
Chemical energy
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B.
Solar energy
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C.
Thermal energy
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D.
Mechanical energy
Solution
Solar energy is the primary source of energy for photosynthesis, driving the process.
Correct Answer: B — Solar energy
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Q. What is the role of NADP+ in photosynthesis? (2021)
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A.
Energy storage
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B.
Electron carrier
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C.
Carbon source
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D.
Light absorber
Solution
NADP+ acts as an electron carrier, becoming reduced to NADPH during the light-dependent reactions.
Correct Answer: B — Electron carrier
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Q. What is the significance of the light-independent reactions of photosynthesis? (2023)
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A.
Produce ATP
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B.
Fix carbon dioxide
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C.
Generate oxygen
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D.
Absorb light energy
Solution
The light-independent reactions, or Calvin cycle, are significant for fixing carbon dioxide into organic molecules.
Correct Answer: B — Fix carbon dioxide
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Q. Which gas is a byproduct of photosynthesis? (2023)
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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 photosynthesis during the light-dependent reactions.
Correct Answer: C — Oxygen
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Q. Which of the following processes occurs during the light-dependent reactions of photosynthesis? (2020)
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A.
Calvin cycle
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B.
Photolysis of water
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C.
Carbon fixation
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D.
Synthesis of glucose
Solution
Photolysis of water occurs during the light-dependent reactions, producing oxygen and electrons.
Correct Answer: B — Photolysis of water
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Q. Which of the following processes occurs in the thylakoid membranes? (2020)
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A.
Calvin cycle
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B.
Light-dependent reactions
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C.
Light-independent reactions
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D.
Photorespiration
Solution
The light-dependent reactions of photosynthesis occur in the thylakoid membranes.
Correct Answer: B — Light-dependent reactions
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Q. Which of the following wavelengths of light is least effective for photosynthesis? (2020)
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A.
Red light
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B.
Blue light
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C.
Green light
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D.
Yellow light
Solution
Green light is least effective for photosynthesis because it is mostly reflected by chlorophyll.
Correct Answer: C — Green light
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Q. Which wavelength of light is most effective for photosynthesis? (2020)
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A.
Green light
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B.
Red light
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C.
Blue light
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D.
Yellow light
Solution
Blue light is most effective for photosynthesis as it is absorbed strongly by chlorophyll.
Correct Answer: C — Blue light
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