In the light reaction of photosynthesis, the reaction centre chlorophyll-a has an absorption peak at 700 nm and is designated as P700. This specific reaction centre is a characteristic feature of:

Step-by-step solution

The pigments involved in photochemical reactions are organised into two discrete photochemical light harvesting complexes within Photosystem I (PS I) and Photosystem II (PS II). In PS I, the reaction centre chlorophyll-a has an absorption peak at 700 nm, hence is called P700. In PS II, the reaction centre chlorophyll-a has an absorption maximum at 680 nm, and is called P680. The light harvesting antenna consists of pigment molecules that absorb light and transfer energy to the reaction centre, but they are not the