Inside the stroma of the chloroplast, there is a suspended:

Explanation

The stroma is the fluid-filled matrix of the chloroplast that surrounds the thylakoid membranes. It serves as the site for many biochemical reactions, including the Calvin cycle, which synthesizes glucose from carbon dioxide and water. Within the stroma, a complex membrane system composed of thylakoids is suspended; these flattened sacs are arranged in stacks called grana and are responsible for the light-dependent reactions of photosynthesis. In addition, the stroma contains a set of enzymes that catalyze the light-independent reactions, as well as chloroplast DNA, ribosomes, and various organic molecules. Thus, the stroma provides both the structural framework and the enzymatic environment necessary for the complete process of photosynthesis.