Match Column-I with Column- II.

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)

Which of the following bacteria reduce nitrate in soil into nitrogen ?

1. Nitrobacter

2. Thiobacillus

3. Nitrococcus

4. Nitrosomonas

Select the mismatch:

1. Rhodospirillum - Mycorrhiza

2. Anabaena - Nitrogen fixer

3. Rhizobium - Alfalfa

4. Frankia - Alnus

The free-living, anaerobic nitrogen-fixer is

1. Beijerinckia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

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

Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla

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 

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