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

Which bacteria is utilized in a Gobar gas plant:

1. Methanogens

2. Nitrifying bacteria

3. Ammonifying bacteria

4. Denitrifying bacteria

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