Question

What is red drop phenomenon?

(a) Falling of red color in the spectrum

(b) Drop in quantum yield in the red region of the spectrum

(c) Drop in quantum yield in the far-red region of the spectrum

(d) Falling of far-red color in the spectrum

I got this question in an interview.

Origin of the question is Photosynthesis topic in section Bioenergetics and Metabolism of Life Sciences

Answer 1

Right answer is (c) Drop in quantum yield in the far-red region of the spectrum

Explanation: Red drop phenomenon describes the drop of quantum yield in far-red region i.e. above 680nm wavelength. It was observed that quantum yield remain same till 680nm and after that, it declined sharply.