As a right-hand thumb rule, a label is nothing but a word or phrase assigned to a specific part of a diagram to help the reader identify it. The chloroplast labeled diagram shows an outer membrane, intermembrane space, lipid droplet, Chloroplast DNA, Lamella, Granum, Starch Granule, Ribosome, Lumen Thylakoid, Stroma, and Inner Membrane. It should be noted here that labeling the diagrams is very important for multiple reasons. For instance, they help describe each part to help people know what they are looking at. In addition to this, labeling the diagrams will also let you know if you have designed the diagram correctly or not.