Plant leaves contain small openings called stomata, through which carbon dioxide, one of the requirements for photosynthesis, enters the plant.
Stomata are minute openings or pores in plant tissue that permit gas exchange. Stomata are generally found in plant leaves but can also be found in some stems. Specialised cells known as guard cells surround stomata and play a role to open and close stomatal pores.
Stomata permit a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to lessen water loss by closing when conditions are hot or dry. Stomata look like small mouths that open and close as they aid in transpiration. Plants that live on land generally have thousands of stomata on the surfaces of their leaves.
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