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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 oxygen and CO2 through photosynthesis and respiration respectively. |
Release of CO2 in the atmosphere by the burning of fossil fuels, wood, etc. |
| 2. Oxygen cycle |
Release of O2 through photosynthesis and its consumption in processes like respiration etc. |
Photodissociation of water vapour in the upper atmosphere, as a result of which oxygen is released when water molecules are split by light and combustion. |
| 3. Nitrogen cycle |
Nitrogen fixation, nitrification, ammonification | Nitrogen fixation in the atmosphere and denitrification |
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