In a chloroplast, the light dependent reactions take place in the

Explanation

Chlorophyll and the electron carriers are embedded in the thylakoid membranes, which are stacked into grana to give the largest possible area for absorbing light. The stroma is the surrounding fluid, and it is where the light independent reactions fix carbon dioxide using the ATP and reduced NADP made in the membranes. Dividing the organelle this way keeps the two stages physically separate.