what organelles does photosynthesis occur in
CHLOROPLASTS. All of the black dots in the picture represent chloroplasts, which are the cell organelles in plant cells where the chemical reactions of photosynthesis take place. You should notice that the vast majority of chloroplasts are found in the cells of the mesophyll.
In plants, these proteins are held inside organelles called chloroplasts, which are most abundant in leaf cells, while in bacteria they are embedded in the plasma membrane. In these light-dependent reactions, some energy is used to strip electrons from suitable substances, such as water, producing oxygen gas.