Question

Complete the following table (Carefully study the carbon, oxygen and nitrogen eye
Bio-geo-chemical cycles Biotic processes
Abiotic processes
1. Carbon cycle
2. Oxygen cycle
3. Nitrogen cycle
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Answer 1

1. Carbon cycle:

• Biotic processes :

Release of oxygen and CO2 through photosynthesis and respiration respectively.

• Abiotic processes :

Release of co2 in the atmosphere by the burning of fossil fuels, woods, etc.

2. Oxygen cycle :

• Release of o2 through photosynthesis and it's 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.

3. Nitrogen cycle :

• NITROGEN fixation, nitrification, ammonia cation.

• NITROGEN fixation in atmosphere and denitrification.

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