Here's a breakdown:

* Stomata: These are tiny pores or openings on the surface of leaves.

* Undersides of leaves: Stomata are typically located on the undersides of leaves, where they are less exposed to direct sunlight and water loss.

* Process: When the stomata are open, carbon dioxide from the atmosphere diffuses into the leaf through these pores. This carbon dioxide is then used in photosynthesis to produce sugars for the plant's growth and energy.

Let me know if you have any other questions about plants!