Which process is NOT part of the carbon cycle according to the given list?

• A. Transpiration
• B. Photosynthesis
• C. Respiration
• D. Burning

Answer: (A)

Transpiration is a water-cycle process where plants lose water as vapor through their leaves, and it doesn’t move carbon between the atmosphere, organisms, and storage reservoirs. The carbon cycle, on the other hand, involves processes that transfer carbon in the form of CO2 or organic carbon among air, living things, oceans, and rocks. Photosynthesis pulls CO2 from the air to build sugars, respiration releases CO2 back into the air as organisms metabolize those sugars, and burning releases stored carbon as CO2 when fuel combusts. Since transpiration doesn’t involve carbon transfer, it isn’t part of the carbon cycle, making it the best choice. The other processes directly involve carbon movement between reservoirs.