Sample Questions — The electron transport
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MCQ
Why is oxygen considered a byproduct of photosynthesis rather than the main product?
✅ Correct Answer: B
Oxygen results from water splitting to replenish electrons at PSII and is released as a byproduct.
MCQ
Why is cytochrome b6f important in the ETC?
✅ Correct Answer: A
Cytochrome b6f is a membrane-bound complex that passes electrons and helps generate the proton gradient.
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MCQ
Why is oxygen released only at PSII and not PSI?
✅ Correct Answer: B
The oxygen-evolving complex is associated with PSII, where water is split to provide electrons.
MCQ
What is the source of electrons for the electron transport chain in chloroplasts?
✅ Correct Answer: C
Water is split in PSII, releasing electrons that enter the electron transport chain.
MCQ
Assertion (A): Oxygen evolution is linked to the inner side of the thylakoid membrane.
Reason (R): The water-splitting complex associated with PSII is located on the inner side of
the thylakoid.
✅ Correct Answer: A
The splitting of water, which produces oxygen, occurs on the inner (lumen-facing) side of the thylakoid where the water-splitting complex is situated.
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