The reaction centre in PS II has an absorption maxima at
(1) 680 nm (2) 700 nm
(3) 660 nm (4) 780 nm
The reaction center in Photosystem II (PS II) has an absorption maximum at 680 nm. This is often referred to as P680. P680 is the primary pigment that initiates the photochemical reactions in Photosystem II, which is a key component of the photosynthetic electron transport chain in plants, algae, and cyanobacteria. Therefore, the correct answer is (1) 680 nm.