A grouping of photosynthetic pigments and associated proteins is called a ______, which is embedded in the thylakoid membrane of chloroplasts.

The answer to your question is "photosystem."

In plants, photosystems are crucial components of the photosynthetic process. They consist of a complex of proteins and pigments that capture light energy, which is then used to drive the synthesis of organic molecules from carbon dioxide and water. There are two main types of photosystems in chloroplasts: Photosystem I (PSI) and Photosystem II (PSII). Each photosystem absorbs light at different wavelengths and plays distinct roles in the light-dependent reactions of photosynthesis. The pigments, such as chlorophyll a, chlorophyll b, and carotenoids, are responsible for absorbing specific wavelengths of light and transferring that energy to the proteins in the photosystem, facilitating the conversion of light energy into chemical energy.