Which bacteria is utilized in a Gobar gas plant:

1. Methanogens

2. Nitrifying bacteria

3. Ammonifying bacteria

4. Denitrifying bacteria

During the formation of bread it becomes porous due to the release of CO₂ by the action of:

Which of the following is used to manufacture ethanol from starch:

1. Penicillin

2. Saccharomyces

3. Azotobactor

4. Lactobacillus

During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded:

1. Lipids

2. Lignin

3. Hemi-cellulose

4. Cellulose

Which of the following is true pair of biofertilizers:
1.  Azolla and BGA
2.  Nostoc and legume
3.  Rhizobium and grasses
4.  Salmonella & E. Coli

What is B.O.D.:
1. The amount of $O_2$ utilized by organisms in the water
2. The amount of $O_2$ utilized by microorganisms for decomposition
3. The total amount of $O_2$ present in water
4. All of the above

Which one produces gas by decomposing the gobar (Dung) in gobar gas:
1.  Fungus
2.  Virus
3.  Methanogenic bacteria
4.  Algae

Azolla is used in the cultivation of:

A major component of gobar gas is:

Which one of the following pairs is not correctly matched:

1. Serratia – Drug addiction

2. Spirulina – Single-cell protein

3. Rhizobium – Biofertilizer

4. Streptomyces – Antibiotic