Learn about chloroplasts, the green organelles that perform photosynthesis in plants and algae. See a diagram of chloroplast structure and its parts, such as membrane, thylakoid, stroma and chlorophyll. Chloroplast are plant cell organelles responsible for photosynthesis, converting sunlight into chemical energy using chlorophyll. Their structure includes double membranes, stroma, and thylakoid stacks (grana) where light and dark reactions occur. The following diagram of a chloroplast shows the structure of a chloroplast including the main parts - the chloroplast envelope, the stroma, thylakoids, grana, lamella, and also other structures such as starch granules, circular DNA, ribosomes and lipid globules. The diagram of a chloroplast illustrates its structure and functions within plant cells. Chloroplasts are specialized organelles that perform photosynthesis, the process by which plants and other organisms convert light energy into chemical energy in the form of glucose.
