Chloroplasts- a group of plant cell organelles known as plastids

· They have a double outer membrane- smooth and freely permeable to molecules.

· Elaborate system of membranes inside the chloroplast that provides a large surface area for housing chlorophyll pigments (chemicals of photosynthesis) - the disc shaped membranes that house the chlorophyll are called thylakoids which are stacked into grana.

· The fluid surrounding the grana is called the stroma.

· Chloroplasts have their own DNA and ribosomes and therefore they can produce their own proteins.