Micro-organisms are used in:

$A$ - Scientist Alexander Fleming discovered the first antibiotic.
$R$ - Methanogens are used for fermenting malted cereals and fruit juices to produce ethanol.

Read the following four statements $(A - D)$ and identify the two statements that contain mistakes:
$(A)$ Dough,which is used for making foods such as dosa and idli,is fermented by fungi and algae.
$(B)$ Toddy,a traditional drink of southern India,is made by fermenting sap from palms.
$(C)$ Large holes in 'Swiss cheese' are due to the production of a large amount of methane by $Propionibacterium$ $sharmanii$.
$(D)$ In our stomach,lactic acid bacteria play a very beneficial role in checking disease-causing microbes.
Which are the two statements having mistakes?

Which of the following pairs is mismatched?

Which one of the following pairs is wrongly matched?

Which useful microorganisms act as a source of energy?