(B) Chlorophyll '$a$' exists in different forms in the photosystems. The reaction center of $PS-II$ is $P_{680}$,which absorbs light at wavelengths sh

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(B) Chlorophyll '$a$' exists in different forms in the photosystems. The reaction center of $PS-II$ is $P_{680}$,which absorbs light at wavelengths shorter than or equal to $680 \ nm$. This specific form of chlorophyll '$a$' is known to be fluorescent. Therefore,it is associated with $PS-II$.