Answer:
Stomata
Step-by-step explanation:
Each plant possesses openings on its leaves known as stomata. Stomata are very important for gaseous exchange in plants. Gases enter and leave the plant via the stomata on the leaves.
Carbon dioxide required for photosynthesis is found in air. It enters into the plant through the stomata on its leaves. Oxygen which is produced during photosynthesis also leaves the plant leaves through the stomata on the leaves.