* CO2 is taken in through the stomata: CO2 enters the plant through tiny pores on the underside of leaves called stomata.

* Oxygen is released through the stomata: The oxygen produced as a byproduct of photosynthesis also exits the plant through these same stomata.

Here's a simplified breakdown:

1. CO2 enters: Carbon dioxide from the air diffuses into the leaves through the stomata.

2. Photosynthesis occurs: Inside the chloroplasts (organelles within plant cells), sunlight energy is captured, and CO2 is combined with water to produce glucose (sugar) and oxygen.

3. Oxygen exits: The oxygen is released as a waste product and exits the leaves through the stomata.

So, both the intake of CO2 and the release of O2 occur through the stomata on plant leaves.