Question

Emerson effect indicates the existence of

• A. Two pigment systems
• B. Two photosynthetic units
• C. Two photophosphorylations
• D. None of the above.

Answer 1

Answer: (A)

Two pigment systems

Emerson effect was observed by Robert Emerson in 1957. Emerson effect shows that photosynthesis proceeding very slowly when light of 700 nm wavelength is used can be increased by illuminating with light of shorter wavelength i.e. 650 nm. So, Emerson effect is related to increase in photosynthesis when lights of two different wavelengths are provided together. Emerson effect is also known as enhancement effect. It indicates the existence of two pigment systems, i.e. pigment system I and pigment system II.

So, the correct answer is option A.