Chloroplasts are the site of photosynthesis in eukaryotic cells.
Chloroplasts are disk-like structures composed of a single membrane surrounding a fluid containing stacks of membranous disks. Because of their geen color chloroplast are the only organelles that can be easily seen with a light microscope. There is a single membrane surrounding the chloroplast. This membrane surrounds a fluid called the stroma. Floating in the stroma are stacks of disks made up of membranes, these are the grana.