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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
   


Solution

  
Bio-geo-chemical cycles
 
    Biotic processes  Abiotic processes 
  1. Carbon cycle
 

Release of CO2 through respiration. Fixation of atmospheric Carbon dioxide through photosynthesis. 
 
Release of CO2 in the atmosphere by burning of fossil fuels, wood etc.

  2. Oxygen cycle
 

Release of O2 through
photosynthesis and its consumption in processes like respiration etc.
 
Photo dissociation of water vapour in the upper atmosphere, as a result of which oxygen is released when water molecules are split by light. Evaporation of water at the surface of water bodies.

  3. Nitrogen cycle
 
Nitrogen fixation, nitrification, ammonification.Nitrogen fixation in atmosphere through lightning.

Science
Science and Technology (Solutions)
Standard IX

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