Question

Red drop discovered by Emerson is due to disruption of photochemical activity of

• A. Carotenoids.
• B. PS I.
• C. PS II.
• D. Both B and C.

Answer 1

The correct option is C PS II.

The red drop effect is a sharp decrease in quantum yield (number of oxygen molecules released per quantum of light absorbed- this number is usually 1/8 or 12%) at wavelengths greater than 680 nm in green plants. It is called the ‘red drop’ because it occurs in the red part of the spectrum.

So the correct option is 'PS II'.