The cellular structure where food is produced in plants is the chloroplast.

Here's why:

* Chloroplasts are organelles found in plant cells that contain chlorophyll, the green pigment that captures light energy.

* This captured light energy is used in the process of photosynthesis.

* Photosynthesis is the process where plants convert light energy, carbon dioxide, and water into glucose (sugar) and oxygen. This glucose is the plant's food source.