Nitrogen from animal wastes or plant an animal tissue
O must be fixed near leguminous plants,
O is lost from the system.
O is fixed by bacteria and fungi in the soil.
O is already fixed and can be used.

Respuesta :

System is okay better

Nitrogen from animal wastes or plant an animal tissue  is fixed by bacteria and fungi in the soil.

So, option C is correct one.

How plants and animals get nitrogen ?

  • Since our atmosphere contains 78% of nitrogen but it is very difficult  to take directly by plants and animals.
  • Nitrogen is very essential for all living organism.
  • Plants take nitrogen from soil.
  • Some bacteria and fungi are present in the soil who fix nitrogen from the atmosphere and convert it into nitrogen compound.
  • Then this nitrogen from the soil by root system of the plants.
  • Now plant use this nitrogen for synthesis of proteins and other compounds.
  • Animals who feed plants gets this proteins and other nitrogen compound from plants.
  • When plants and animals die , fungi and bacteria present in the soil converts this nitrogenous waste into nitrogenous compound and reuse of nitrogenous compound is repeated again.

learn about nitrogenous waste,

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