Advertisements
Advertisements
Question
The nitrogen molecules present in the air can be converted into nitrates and nitrites by
Options
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
Solution
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.
APPEARS IN
RELATED QUESTIONS
Long Answer Question:
Explain biological nitrogen fixation with example.
How do human activities affect nitrogen cycle?
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?
In the nitrogen cycle, which of the following play an important role?
The bacteria present in the root nodules of leguminous plants is ______.
The atmosphere is a rich source of ______.
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
Consider the following statements. Which of the statements given below is incorect?
