NEET 2016 Biology question

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 simultaneouslyCorrect
(3)Photophosphorylation and cyclic electron transport
(4)Oxidative phosphorylation

Answer: (2)

Solution

Emerson observed that the quantum yield of photosynthesis falls sharply for light of wavelength longer than about 680 nm (the "red drop"), but that yield rises above the sum of the separate yields when red light (about 680 nm) and far-red light are given together (the "enhancement effect").

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Question ID VK-091931