What is chloroplast and what does it do in plant cell – learn its location, parts, structure & functions of the organelle in biology described with labeled picture 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. This diagram of chloroplast shows the inner and outer membrane, intermembrane space, thylakoid membrane, stroma, and lamellae. The labeled diagram of chloroplast picture is given below: