AP BIOLOGY

Detailed explanation-1: -It means when higher wavelength of light is simultaneously supplied with shorter wavelength, then rate of photosynthesis increased. So, the discovery of Emerson effect showed the existence of two distinct reaction centres and photochemical reactions. It showed the existence of Photosystems I and II.

Detailed explanation-2: -The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to light of wavelength 680 nm (deep red spectrum) and more than 680 nm (far red spectrum).

Detailed explanation-3: -The Emerson enhancement effect refers to the increase in quantum yield of photosynthesis when monochromatic beams of two different wavelengths (680 and 700 nm) are used together on the test organism (Chlorella).

Detailed explanation-4: -Emerson effect shows that photosynthesis proceeding very slowly when the 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.

Detailed explanation-5: -When simultaneously exposed to light of both wavelengths, the rate of photosynthesis is far higher than the sum of the red light and far red light photosynthesis rates.-These effects are an evidence of the existence of 2 Photosystems.