Which one of the following pairs is wrongly matched?

Identify the correct statement.

Which of the following statements are associated with silage?
$(i)$ Prepared with the help of $Propionibacterium$ $sharmanii$.
$(ii)$ Used in the preparation of bread.
$(iii)$ It is a type of cattle feed.
$(iv)$ Used for the production of ethanol.
$(v)$ Produced by the fermentation of carbohydrates present in green plant tissues.

Identify the colonies labelled as $A$ and $B$.

Which one of the following is correct?

Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.