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

Options

A. two photosystems operating simultaneously
B. photosphorylation and cyclic electron transport
C. oxidative phosphorylation
D. photophosphorylation and non - cyclic electron transport

Answer

A

Explanation

Emerson performed photosynthetic experiment on Chlorella. He provided monochromatic light of more than 680 nm and observed a decrease in the rate of photosynthesis. This is known as red drop.
Later , he provided synchronished light of 680 nm and 700 nm and observed a increase in the rate of photosynthesis. This is known as Emerson enhancement effect. this experiment led to discover of two photosystem -PS-I `(P_700)` and PS-II `(P_680)` operating in photosynthesis.