Answer:
Thylakoid membrane and involved in light reaction.
Step-by-step explanation:
In photosynthesis there are two subunits (photosystem 1 and photosystem 2).The system occurs in the Thylakoid membrane of the chloroplast.
Photosystem 1 and photosystem 2 are involved in light reaction.
Photosystem 1 and photosystem 2 function as reaction center during photosynthesis.Photosystem 1 can absorb maximum 700nm wavelength of light whereas the maximum wavelength of light that can be absorbed by photosystem 2 is 680nm.