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

Options

(a) Photophosphorylation and non-cyclic electron transport
(b) Two photosystems operating simultaneously
(c) Photophosphorylation and cyclic electron transport
(d) Oxidative Phosphorylation

Correct Answer:

Two photosystems operating simultaneously

Explanation:

The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to the light of wavelength 670 nm (red light) and 700 nm (far-red light). When simultaneously exposed to the light of both wavelengths, the rate of photosynthesis is far higher than the sum of the red light and far-red light photosynthesis rates ( known as enhancement effect ). This experiment led to the discovery of two photosystems. – PS II and PS I.