The oxygen produced during photosynthesis leaves the leaf through tiny pores called stomata.

Here's a breakdown:

* Photosynthesis: This process uses sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen.

* Stomata: These are small openings on the underside of leaves. They are surrounded by guard cells that control their opening and closing.

* Oxygen Release: During photosynthesis, the oxygen produced as a byproduct diffuses from the chloroplasts (where photosynthesis takes place) into the surrounding cells and then out through the stomata.

So, the oxygen produced in photosynthesis travels a short distance within the leaf before exiting through the stomata!