Match Column-I with Column- II.

Column I Column II
(a) Nitrococcus
(b) Rhizobium
(c) Thiobacillus
(a) Nitrobactèr
(i) Denitrification
(ii) Conversion of ammonia to nitrite
(iii) Conversion of nitrite to nitrate
(iv) Conversion of atmospheric nitrogen to ammonia

Choose the correct answer from the options given below.

    (a) (b) (c) (d)

1. (iii) (i) (iv) (ii)

2. (iv) (iii) (ii) (i)

3. (ii) (iv) (i) (iii)

4. (i) (ii) (iii) (iv)

Subtopic:  Nitrogen Fixation |
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Which of the following bacteria reduce nitrate in soil into nitrogen ?

1. Nitrobacter

2. Thiobacillus

3. Nitrococcus

4. Nitrosomonas

Subtopic:  Nitrogen Fixation |
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Select the mismatch:

1. Rhodospirillum - Mycorrhiza

2. Anabaena - Nitrogen fixer

3. Rhizobium - Alfalfa

4. Frankia - Alnus

Subtopic:  Nitrogen Fixation |
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Nitrifying bacteria

1.  convert free nitrogen to nitrogen compounds
2.  convert proteins into ammonia
3.  reduce nitrates to free nitrogen
4.  oxidize ammonia to nitrates

Subtopic:  Nitrogen Fixation |
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The free-living, anaerobic nitrogen-fixer is

1. Beijerinckia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D

   

  Options :
              A                          B                         C                                D
1. Denitrification      Ammonification              Plants                       Animals
2. Nitrification            Denitrification              Animals                     Plants
3. Denitrification           Nitrification                Plants                      Animals
4. Nitrification             Ammonification            Animals                     Plants

Subtopic:  Nitrogen Fixation |
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Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla

Subtopic:  Nitrogen Fixation | Genetics & Biochemistry of Nitrogen Fixation |
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Nitrogen-fixation in root nodules of Alnus is brought about by
1.  Bradyrhizobium
2.  Clostridium
3.  Frankia
4.  Azorhizobium
Subtopic:  Nitrogen Fixation | Genetics & Biochemistry of Nitrogen Fixation |
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All of the following statements concerning the Actinomycetous filamentous soil bacterium Frankia are correct EXCEPT that Frankia
1. Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
2. Can induce root nodules on many plant species
3. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex
4. Cannot fix nitrogen in the free-living state 

Subtopic:  Nitrogen Fixation |
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If by radiation all nitrogenase enzyme are inactivated, then there will be no :-
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes

Subtopic:  Nitrogen Fixation |
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