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Emerson's enhancement effect and red drop were instrumental in the discovery of
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
Emerson found that the rate of photosynthesis fell sharply in far-red light beyond 680 nm (red drop), but rose above the sum of the separate rates when red and far-red light were given together (enhancement effect). This showed that two photosystems work together.
Why the other options are wrong
- (b) · your answer Photophosphorylation was not what these experiments revealed; they pointed to two photosystems acting together.
- (c) · your answer Oxidative phosphorylation is part of respiration in mitochondria, not of photosynthesis.
- (d) · your answer Cyclic electron transport needs only PS I; the enhancement effect needs both PS I and PS II.
NCERT point: The two photosystems (PS I with P700 and PS II with P680) work in series in the Z scheme of non-cyclic electron transport.
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