Tag: uses of microorganisms

• Nitrogen fixation is a process by which atmospheric nitrogen is converted into ammonium compounds and made available for plants. Examples include Rhizobium, Azotobacter.
• Many bacteria are also involved in the sewage disposal process. Mostly saprophytic aerobic bacteria are used in treatment plants.
• During the process of ripening of cream, Lactic acid bacteria are used. These bacteria convert lactose into acid and results in the curdling of cream.
  

Grazing is a method of feeding in which an animal feeds on plants such as grasses. The animals are called grazing animals. They are also called as Ruminants. Examples include cattle, sheep, goats, deer. They are capable of digesting cellulose present in the plants. The cellulose is digested by intestinal bacteria present in them. These bacteria possess the necessary enzymes to digest cellulose in the GI tract.

• Escherichia coli, also known as E. coli, is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms.
• Escherichia coli (E. coli) bacteria normally live in the intestines(colon) of Humans and animals.
  
• E.coli  is nonpathogenic bacteria of the colon because it is present in the colon but do not cause any disease.
• So, the correct answer is 'E.coli'.

Clostridium butylicum is used to produce butyric acid. Lactic acid is produced by Acetobacter.