There is a clear division of labour within the chloroplast because:

Within the chloroplast there is membranous system consisting of grana, the stroma lamellae, and the stroma. There is a clear division of labour within the chloroplast. The membrane system is responsible for trapping the light energy and also for the synthesis of ATP and NADPH+H+. In stroma, enzymatic reactions synthesize sugar, which in turn forms starch.