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Emerson’s enhancement effect and Red drop have been instrumental in the discovery of

1. photophosphorylation and non-cyclic electron transport
2. two photosystems operating simultaneously
3. photophosphorylation and cyclic electron transport
4. oxidative phosphorylation

Correct answer: two photosystems operating simultaneously

Solution

Emerson’s enhancement effect and the Red drop revealed that photosynthesis is not driven by a single light reaction. Instead, they supported the idea that two distinct photosystems work together, with far-red light exposing the limitation of one system and combined wavelengths restoring higher efficiency.

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