Thiobacillus is a group of bacteria helpful in carrying out:

1. Denitrification

2. Nitrogen fixation

3. Chemoautotrophic fixation

4. Nitrification

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

1. Nitrobacter

2. Thiobacillus

3. Nitrococcus

4. Nitrosomonas

The product(s) of the reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are.

1. Nitrate alone

2. Ammonia and oxygen

3. Ammonia and hydrogen

4. Ammonia alone

Match the following concerning essential elements and their functions in plants :

(a) Iron            (i) Photolysis of water

(b) Zinc           (ii) Pollen germination

(c) Boron         (iii) Required for chlorophyll biosynthesis

(d) Manganese  (iv) IAA biosynthesis

Select the correct option:

     (a)  (b)  (c)  (d)

1.  (iv) (iii)  (ii)  (i)

2.  (iii)  (iv) (ii)  (i)

3.  (iv)  (i)  (ii)  (iii)

4.  (ii)   (i)  (iv)  (iii)

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

1. Ammonia

2. Glutamate

3. Nitrates

4. Ureides

Which of the following elements helps in maintaining the structure of ribosomes?

1. Magnesium

2. Zinc

3. Copper

4. Molybdenum

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 one of the following process is responsible for the release of \(N_2\) in the atmosphere? 
1. Industrial Nitrogen fixation 
2. Ammonification 
3. Denitrification 
4. Biological nitrogen fixation