The organisms that are present in the gut of several ruminant animals such as cows and buffaloes are

• A

  also responsible for the production of methane (biogas).

• B

  used in polishing, filtration of oils and syrups.

• C

  known to be behave as autotrophs in present of light and as heterotrophs in absence of light.

• D

  also responsible for causing ergot of rye.