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Plants and Respiration Plants breathe just like humans, but they do not have lungs. They absorb gases through their leaves, stems, and roots. Plants require two essential gases: oxygen and carbon dioxide. How Do Gases Enter Plants? Plants take in gases through a process called diffusion, in which gases move from areas of higher concentration to areas of lower concentration. During photosynthesis, leaf cells use carbon dioxide, reducing its concentration inside the leaf and allowing new gas to en