Question

3. Explain nitrogen cycle and draw a schematic diagram of nitrogen cycle.

Answer 1

in nitrogen cycle nitrogen is converted in nitrogenous compounds by microorganisms like rhizobium bacteria
nitrogen is also converted into compounds by other factors like by plants and animals,atmosphere , biologically etc

Answer 2

$\huge\mathfrak{\underline{\underline{\red{Answer:-}}}}$

• Nitrogen in its atmospheric form cannot be used by plants. It needs to be converted into nitrogen containing compounds for easy utilization by plants.

• The process by which nitrogen in the atmosphere is converted into compounds which can be used by plants and animals is called nitrogen fixation
• As nitrogen is required by all forms of life including plants and animals, nitrogen fixation is essential.
• Rhizobium is a nitrogen-fixing bacterium that is found in the roots of leguminous plants.
• It is able to fix Atmospheric nitrogen into useful compounds, which can be used by plants to produce proteins. When these plants are eaten by animals, the fixed nitrogen is used by them to make proteins and amino acids.

• After plants and animals die, decomposers act on the proteins and amino acids to return nitrogen compounds back to the soil.
• Chemical fertilizers also add nitrogen compounds in their soil.
• Nitrate gases are released back into the atmosphere.
• These gases react with water in the atmosphere and return to soil through rainwater, certain special bacteria present in the soil also help to return nitrogen back into atmosphere.
• The nitrogen cycle is a continuous series of natural processes by which atmospheric nitrogen passes to the soil, and then the organisms ,and back to air or soil, involving nitrogen fixation and decay.