The cell organelle involved in the process of photosynthesis is the chloroplast.

Here's why:

* Chloroplasts contain chlorophyll: This green pigment absorbs light energy, which is the primary fuel for photosynthesis.

* They have a complex internal structure: This structure allows for the efficient capture of light energy and the conversion of carbon dioxide and water into glucose (sugar) and oxygen.

Let me know if you'd like to know more about the structure of chloroplasts or the process of photosynthesis!