A
Fermentation in absence of oxygen
B
Fermentation in presence of oxygen
C
None of the above
D
Option 1 and 2
Solution:
The fermentation of animal dung that takes place in the absence of air due to the presence of anaerobic bacteria present in animal dung is called anaerobic fermentation. Biogas is produced through an anaerobic fermentation process. Biogas is a type of renewable energy.
