The role of photosynthesis and respiration in Carbon cycle in nature are as follows:
(a) Plants convert the carbon in atmospheric carbon dioxide into carbon containing organic compounds, such as sugars, fats, and proteins.
(b) Cellular respiration (in plants and animals) requires oxygen (which is the by-product of photosynthesis) and it produces carbon dioxide, which is used in photosynthesis.
In this way, photosynthesis and cellular respiration are linked in the carbon cycle.
