Question

$P_{680}$ is related with

• A. PS- I
• B. PS- II
• C. Hill reaction
• D. None of the above

Answer 1

The correct option is B PS- II

P${}_{680}$ is the primary donor present in photosystem II. Structurally, it's chlorophyll pigment dimer is present at the center of photosystem II. 680 suggests that the absorption is maximum at 680nm in red light. P${}_{680}$ or primary donor receives energy either by absorbing light or by excitation of electrons present in nearby chlorophyll. The excited electrons get captured by electron acceptor present in photosystem II, which is pheophytin and oxidized P${}_{680}$ is then reduced by electron generated from water during oxygenic photosynthesis.