Each photosystem consists of a light-gathering:

Explanation

Each photosystem contains an antenna complex and a reaction center. The antenna complex is responsible for capturing light energy using pigments like chlorophyll and carotenoids and directing it toward the reaction center. The reaction center contains chlorophyll a and a primary electron acceptor, where the energy from the captured light excites electrons and initiates the electron transport chain. This division of roles ensures that light energy is efficiently harvested by the antenna complex and then converted into chemical energy in the reaction center, enabling the production of ATP and NADPH for the Calvin cycle.