Photosystem I and photosystem II are found in:

Explanation

Photosystem I and photosystem II are integral components of the light-dependent reactions in photosynthesis. They are located in the thylakoid membranes of the grana within chloroplasts. These photosystems capture light energy and facilitate the transfer of electrons, essential for the synthesis of ATP and NADPH. The stroma, on the other hand, is where the Calvin cycle (light-independent reactions) occurs, while the mitochondria are involved in cellular respiration, not photosynthesis.