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Q.
In which of the following wavelength, photosystem-I is inactive?
Delhi UMET/DPMTDelhi UMET/DPMT 2008Photosynthesis in Higher Plants
Solution:
In $780\, nm$ of wavelength photosystem-I is reactive. In photosystem-I, the photocentre is special chlorophyll-a molecule called $P_{700}$. PS-I has a reducing agent $X,\, Fe-S$ centre, plastoquinone, cytochrome complex and piastocyanin. Part of the spectrum used in photosynthesis has a wavelength between $400-700\, nm$. In photosystem-II a very small amount of special form of chlorophyll-a, called $P_{680}$ is present.