Question

Write a short note on carbon cycle.

Answer 1

Carbon cycle:
Carbon enters life forms through the process of photosynthesis. During photosynthesis, carbon dioxide and water combine to produce glucose and oxygen. This changes the atmospheric carbon into glucose molecules.
Glucose is utilised by organisms to produce energy through respiration. During this process, glucose is broken down in the presence/absence of oxygen to produce carbon dioxide.
Another process that releases carbon dioxide is combustion or burning. Many substances release carbon dioxide on burning. Vehicular emissions, industrial fumes and the gases released during the process of cooking are some instances of release of carbon dioxide through combustion.
Thus, carbon is cycled repeatedly through different forms by various physical, chemical and biological activities.