The organelle that is present in a potato cell but not a cheek cell is the chloroplast.

Here's why:

* Potato cells are plant cells and need to perform photosynthesis to produce their own food. Chloroplasts are the sites of photosynthesis, containing chlorophyll which absorbs sunlight to power the process.

* Cheek cells are animal cells. Animals do not perform photosynthesis and therefore do not have chloroplasts.