Question

Red drop is

• A. Drop in oxygen yield.
• B. Drop in quantum yield.
• C. Drop in organic yield.
• D. Drop in photosynthetic yield.

Answer 1

The correct option is B Drop in quantum yield.

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.

Hence answer is 'Drop in quantum yield'