Carbon cycle and nitrogen cycle

Carbon Cycle: 1)The photosynthetic plants of forest and ocean,chemosynthetic bacteria uses sunlight in the presence of chlorophyll to trap carbon into sugar(fats and sugars).The trapped carbon comes from carbon dioxide in the atmosphere.
2)The photosynthesis convert carbon dioxide from atmosphere or dissolved in water into glucose.These glucose molecules are either converted into other substances or used to provide energy for synthesis of other biologically important molecules.
3)Then by respiration,both consumers and producers return carbon dioxide to atmosphere.
4)The combustion of fossil fuels(Coal,petroleum) during cooking,heating,transportation,industrial processes adds carbon dioxide to atmosphere.
5)The plants and animals decompose for millions of years to form fossil fuel.
6)Ocean is a carbon sink.

Nitrogen Cycle: Nitrogen is a vital element. It is a part of most of the cellular components like proteins, nucleic acids (DNA and RNA), vitamins, etc. It is also a major constituent of chlorophyll in plants. Plants obtain their nitrogen from the soil while animals obtain it from plants. A cycle of processes helps in maintaining the concentration of nitrogen in the atmosphere and meet the requirement of every organism. This cycle of nitrogen is called the nitrogen cycle.
The nitrogen cycle is the recycling and reusing of nitrogen in different forms to meet the demand for various environmental activities. This happens through various processes with the help of certain microorganisms. In the atmosphere, nitrogen is available in a diatomic form i.e. N2. Plants and certain organisms can’t use nitrogen in this form. Therefore N2 is converted into nitrogen oxides like NO, NO2, NO3. Various processes like lightning; industrial combustion, forest fire etc. contribute to these oxides.