Nitrogen Fixation
Nitrogen Fixation
Nitrogen Fixation :
Nitrogen present in the atmosphere cannot be absorbed directly by most plants and animals. It can be used only by a few simple organisms. The rest can use nitrogen only when it is converted into nitrates and nitrites. Certain microorganisms do this.
The process of converting free nitrogen of the atmosphere into compounds of nitrogen is called nitrogen fixation.
This is the process by which nitrogen of the nonliving world enters the living system. Nitrogen fixation occurs in three ways:
(i) Atmospheric Fixation: The high temperatures and pressures produced during lightning allow nitrogen to combine with oxygen in the atmosphere to form oxides of nitrogen. These dissolve in rain water and get soaked into the soil, and form nitrates.
Nitric acid is carried by rain water to the soil where it forms nitrates. The nitrates get stored in the soil and the atmospheric nitrogen is fixed. The nitrates present in the soil are then absorbed by plants.
The practice of growing different crops on the same piece of land in a pre-planned succession is called crop rotation. If same crop is grown in a piece of land year after year, it reduces the fertility of the soil. Moreover, the disease causing pathogens get their hosts every year and so they multiply and increase in number. This can be avoided by growing different crops in a pre-planned succession. During crop rotation, leguminous crops are also grown in rotation with non-leguminous crops. Leguminous plants are provided roots. The root nodules contain nitrogen fixing bacteria (Rhizobium), which have the ability to fix up atmospheric nitrogen into nitrates and in turn enrich the soil. The root nodules of leguminous plants have the ability to fix | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) The process of converting free nitrogen of the atmosphere into compounds of nitrogen is called nitrogen fixation. (b) The nitrates get stored in the soil and the atmospheric nitrogen is fixed. (c) Nitrogen present in the atmosphere cannot be absorbed directly by most plants and animals. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) The fixation of nitrogen by some nitrogen-fixing bacteria is called biological nitrogen fixation. (b) The process of converting free nitrogen of the atmosphere into compounds of nitrogen is called nitrogen fixation. | |||
| Right Option : C | |||
| View Explanation | |||
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