Question

Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles)

 

 

Bio-geo-chemical cycles	Biotic processes	Abiotic processes
1. Carbon cycle
2. Oxygen cycle
3. Nitrogen cycle

Answer 1

Bio-geo-chemical cycles	Biotic processes	Abiotic processes
1. Carbon cycle	Photosynthesis -Release of oxygen and Respiration - Release of oxygen CO2   Decomposition by decomposers.	Release of CO2 in the atmosphere by combustion.   Absorption by Water
2. Oxygen cycle	Photosynthesis and Respiration.   Decomposition by decomposers.	Combustion.   Photo dissociation of water vapour in the upper atmosphere, as a result of which oxygen is released when water molecules are split by light
3. Nitrogen cycle	Decomposition by decomposers, Biological fixation by bacteria, ammonification	Industrial fixation, Nitrogen fixation in atmosphere and denitrification