The structure of the chloroplasts includes the outer membrane and a system of inner membranes organized into stacks called grana. The inner portion without the stacks is called the stroma. Grana stacks are made of disk like structures piled on top of one another. These disks are called thylakoid disks. The electron transport processes associated with the light reactions of photosynthesis occur in the thylakoids.
Stroma is the amorphous material inside the chloroplast.
This is where the enzymes of the Calvin cycle are located. Mitochondria are responsible for aerobic cellular respiration. There is an outer membrane and an inner membrane system called the cristae. The cristae protrude into the matrix. Cristae are the location for the electron transport processes of the cytochrome chain involved in cellular respiration.