There is a clear division of labour within the chloroplast.

pls explain this sentence. i m unable to undersand.

Membranous system is present within the chloroplast consisting of grana, the stroma lamellae, and the fluid stroma which is responsible for division of labour. These membrane systems bring partitions within the chloroplast where different activities can be carried out. In stroma, dark reactions of photosynthesis occur. In membrane of thylakoids (parts of granum), light reactions are carried out .