A leaf is a green, usually flat plant organ that grows above ground and is primarily responsible for photosynthesis and gas exchange. It typically consists of a broad, flat blade that absorbs sunlight and performs photosynthesis, converting light energy into food for the plant. Leaves also regulate the exchange of gases like carbon dioxide, oxygen, and water vapor through small openings called stomata. Leaves come in various shapes, sizes, and structures, with some being simple (a single blade) and others compound (multiple leaflets). They are vital for the plant's food production and play a crucial role in the ecosystem by producing oxygen and sustaining life.
