The textbook the quantum efficiency for photosynthesis decreases abruptly when the wavelength of light being used becomes longer the 680 nm. which one of the following is the explanation for this "red drop"?
a. the reactions that extract electrons from water to make o2 take place in the photosystem that is activated by 680 nm light.
b. red light inhibits photosynthesis.
c. photosystem i requires 680 nm light
d. red light is absorbed co2 to initate the synthesis of carbohydrates.
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