Stomata are cells that contract/expand to open/close pores for gas exchange. They adjust to temperatures so they stay closed when the climate is hot and dry to stop water and gas from being lost. Stomata makes it easier for photosynthesis to happen.
Photosynthesis actually happens in the chloroplast. Light reactions in the thylakoid membrane produce oxygen, atp/energy, and NADPH. The Calvin Cycle in the stroma uses carbon dioxide, atp, and NADPH to make carbohydrates (glucose/sugars).
