On land,the carbon used today in photosynthesis to form carbon atoms of plant tissues is mostly returned to the air because of

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Respiration in plants, animals, and organisms in the soil releases the carbon that was fixed during photosynthesis back into the atmosphere as carbon dioxide. This is commonly known as the carbon cycle, where carbon atoms move between the atmosphere, plants, animals, soil, and other organisms. Plate tectonics, erosion, decay, and weathering also play a role in the carbon cycle but do not primarily affect the carbon fixed during photosynthesis. Additional photosynthesis in the same plants can also fix more carbon, but it does not directly affect the carbon that was already fixed and currently present in the plant tissues.

On Land,the Carbon Used Today in Photosynthesis to Form Carbon