Question

secondary electron acceptor in PS II

Answer 1

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Photosystem II primary donor, (where P stands for pigment) refers to either of the two special chlorophyll dimers (also named special pairs), PD1 or PD2.[ These 2 special pairs form an excitonic dimer, which means that they behave in function as a single entity; i.e., they are excited as if they were a single molecule.

The 680 number is its absorption maximum in the red part of the visible spectrum (680 nm). The primary donor receives excitation energy either by absorbing a photon of suitable frequency (colour) or by excitation energy transfer from other chlorophylls within photosystem II