Photosynthesis only happens in plant cells (and some types of bacteria and algae).

Here's why:

* Chloroplasts: Plant cells have specialized organelles called chloroplasts. These contain chlorophyll, a green pigment that absorbs light energy from the sun. Chloroplasts are the sites where photosynthesis takes place.

* Animal cells lack chloroplasts and chlorophyll. They cannot capture sunlight energy and therefore cannot perform photosynthesis. They obtain energy by consuming food (heterotrophic).