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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
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
Explain the following cycle in your own words with a suitable diagram.
Nitrogen cycle.
Long Answer Question:
Explain biological nitrogen fixation with example.
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?
______ is the primary nutrient, important for the survival of all living organisms.
The bacteria present in the root nodules of leguminous plants is ______.
Assertion (A): Plants and animals can utilize atmospheric nitrogen.
Reason (R): The atmosphere is a rich source of nitrogen.
Which of the following statement is incorrect with regard to combustion?
Consider the following statements. Which of the statements given below is incorect?
Match the following:
| Column A | Column B (Organisms) | ||
| (1) | Symbiotic nitrogen fixation | (a) | Nitrobacter |
| (2) | Denitrification | (b) | Cyanobacteria |
| (3) | Free living nitrogen fixers | (c) | Rhizobium |
| (4) | Nitrification | (d) | Paracoccus |
