Nitrogen Cycle and Nitrogen Fixation
Nitrogen Cycle and Nitrogen Fixation
Nitrogen Cycle:
Air contains 78% nitrogen in atmosphere. Water bodies also contain nitrogen. Nitrogen is an essential component of proteins, Vitamins and nucleic acids present in all living things. It is a natural cyclic in which atmospheric nitrogen enters the soil and becomes a part of living organisms, organisms, before returning to the atmosphere. It has three steps:
Nitrogen Fixation:
Nitrogen fixation is the process by which free atmospheric nitrogen is converted into nitrogen compounds. It is of two types:
a. Atmospheric Nitrogen Fixation: during lightning in the sky when temperature is high, the nitrogen gas present in the atmosphere reacts with oxygen to produce oxides of nitrogen which bets dissolved in rainwater to form nitric acids.
b. Biological Nitrogen Fixation: atmospheric nitrogen is converted into nitrogen compounds by living organisms. Nitrogen fixing bacteria like Rhizobium and Clostridium which lives in the root nodules of leguminous plants converts atmospheric nitrogen into nitrates.
1. Nitrogen assimilation: the conversion of inorganic compounds into organic compounds is called nitrogen assimilation. The plants absorb nitrogenous compound from the soil and water and convert them into plant proteins.
2. Denitrification: the conversion of nitrate salt which is present in the soil to free nitrogen gas is called Denitrification. It is carried out in the soil by bacteria called Psedomonas.
Which of the following are correct : (a) Atmospheric nitrogen is converted into nitrogen compounds by living organisms. (b) Nitrogen fixing bacteria like Rhizobium and Clostridium which lives in the root nodules of leguminous plants converts atmospheric nitrogen into nitrates. (c) The conversion of nitrate salt which is present in the soil to free nitrogen gas is called Denitrification. | |||
| Right Option : D | |||
| View Explanation | |||
Haber's process involves combining nitrogen and hydrogen to yield | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Air contains 78% nitrogen in atmosphere. (b) Nitrogen fixation is the process by which free atmospheric nitrogen is converted into nitrogen compounds. | |||
| Right Option : C | |||
| View Explanation | |||
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