Describe the structure of a chloroplast with the help of a labelled diagram.

Chloroplasts are structures in the leaves that contain chlorophyll, which is required for photosynthesis. The chloroplast has an outer membrane and an inner membrane. Inside every chloroplast, stacks of discs are present. Each disc is called thylakoid. These contain the pigment, chlorophyll and are helpful in absorbing sunlight. The discs of thylakoid are present in stacks and are called grana. The grana are arranged in a fluid called stroma.