the absorption peak of ps1 and ps2 is 700nm and 680 nm respectively ,which is close to the wavelength of red light .then why is the rate of photosynthesis highest in blue light which has a wavelength of aroung 450nm.? pls exlain.

Yes it is true that that rate of photosynthesis is highest in blue light but because of presence of different types of chlorophyll, accessory pigments (carotenes, xanthophylls) the resultant absorption of PSI and PSII comes out to be 700nm and 680nm respectively.

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