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प्रश्न
The nitrogen molecules present in the air can be converted into nitrates and nitrites by
विकल्प
a biological process of nitrogen-fixing bacteria present in the soil
a biological process of carbon fixing factor present in the soil
any of the industries manufacturing nitrogenous compounds
the plants used as cereal crops in the field
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उत्तर
a biological process of nitrogen-fixing bacteria present in the soil
Explanation:
Nitrogen molecules present in the air cannot be used as such by plants and animals and must be converted into biologically 5 acceptable forms. A number of symbiotic and free-living bacteria e.g., Rhizobium, Azotobacter etc. convert nitrogen into ammonia. Most of the ammonium compounds are oxidised by nitrite bacteria (Nitrosomonas and Nitrosococcus) to soluble nitrates, which are further oxidised by nitrate bacteria (Nitrobacter and Nitrocystis) to soluble nitrates.
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संबंधित प्रश्न
Blue green algae fix _________ directly from air to enhance fertility of soil.
How is nitrogen replenished in atmosphere.
Which of the following is TRUE regarding Rhizobium?
The process of nitrogen-fixation by bacteria does not take place in the presence of
Polio drops are not given to children suffering from diarrhoea. Why?
Give reason for the following.
Farmers prefer to grow beans and peas in nitrogen deficient soils.
In the nitrogen cycle, which of the following play an important role?
Match Column - I with Column - II.
| Column - I | Column - II | ||
| (a) | Nitrococcus | (i) | Denitrification |
| (b) | Rhizobium | (ii) | Conversion of ammonia to nitrite |
| (c) | Thiobacillus | (iii) | Conversion of nitrite to nitrate |
| (d) | Nitrobacter | (iv) | Conversion of atmospheric nitrogen to ammonia |
Choose the correct answer from the options given below.
The bacteria present in the root nodules of leguminous plants is ______.
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
