PrepBharat

1. Lightening and UV radiation can cause a reaction between nitrogen and oxygen and produces
a) NO
b) \[NO_{2}\]
c) \[N_{2}O\]
d) All of these

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2. Decomposition of organic nitrogen of dead plants and animals into ammonia is called
a) Nitrogen fixation
b) Nitrification
c) Denitrification
d) Ammonification

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3. What happens to ammonia formed by ammonification?
a) Some gets volatilized
b) Most of it gets converted into nitrate by soil bacteria
c) Some will undergo biological nitrogen fixation
d) Both (a) and (b)

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4. \[2NH_{3}+3O_{2}\rightarrow 2NO_2^-+2H^{+}+2H_{2}O\]
The reaction can be caused by
(1) Nitrosomonas (2) Nitrococcus (3) Nitrobacter
(4) Pseudomonas (5) Thiobacillus
a) 1 and 5 only
b) 1 and 2 only
c) 4 and 5 only
d) only 3

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5. \[2NO_2^-+O_{2}\rightarrow 2NO_3^-\]
This process of nitrification is done by ___________ bacteria.
a) Pseudomonas
b) Thiobacillus
c) Nitrobacter
d) Nitrococcus

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6. Nitrifying bacteria are
a) Photoautotroph
b) Chemoautotroph
c) Heterotrophy
d) All of these

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7. Nitrate present in the soil is also reduced to nitrogen by the process of denitrification it is carried out by
a) Pseudomonas
b) Thiobacillus
c) Rhizobium
d) Both (a) and (b)

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8. Reduction of nitrogen to ammonia by living organism is called
a) Nitrification
b) Denitrification
c) Biological nitrogen fixation
d) Ammonification

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9. \[N\equiv N\rightarrow NH_{3}\]
This reaction is catalyzed by the enzyme
a) Isomerase
b) Nitrogenase
c) Carbonic anhydrase
d) Higase

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10. Frankia produced nitrogen by fixing nodule on
a) Lentils
b) Garden pea
c) Alnus
d) Broad bean

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