In which membranes is the antenna system located?

The antenna system, which is part of the photosynthetic process in plants, is specifically located in the thylakoid membranes. These membranes are found within the chloroplasts and contain various pigment molecules, such as chlorophyll, that capture light energy. This light energy is then transferred to the reaction center during photosynthesis, where it is converted into chemical energy.

The thylakoid membranes are organized into stacks known as granum, which increases the surface area available for light absorption and enhances the efficiency of photosynthesis. This is why the answer points directly to the thylakoid membranes, as they are the functional site for the antenna systems that initiate the light-dependent reactions of photosynthesis.