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