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

Identify the odd group out.

Which one of the following pairs is wrongly matched?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$ :
Assertion $(A)$ : $Spirulina$ is a microbe that can be used for reducing environmental pollution.
Reason $(R)$ : $Spirulina$ is a rich source of protein,carbohydrates,fats,minerals and vitamins.
In the light of the above statements,choose the most appropriate answer from the options given below:

The fruit juices turn bitter in taste if they are kept in open place for some time,because of

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ $LAB$	$(i)$ Cattle feed
$(b)$ $Saccharomyces$	$(ii)$ Increases quality of Vitamin $B_{12}$
$(c)$ $Propionibacterium$	$(iii)$ Bread making
$(d)$ Silage	$(iv)$ Swiss cheese