Which useful microorganisms act as a source of energy?

Match the following columns:

List-$I$	List-$II$
$(a)$ Bacteria	$(1)$ Saccharomyces cerevisiae
$(b)$ Mucor	$(2)$ $Bt$ cotton
$(c)$ Yeast	$(3)$ Penicillium notatum
$(d)$ Transgenic organism	$(4)$ Lactobacillus

Which one of the following pairs is wrongly matched?

Identify the correct statement.

Microbes are used in:
$1.$ Primary treatment of sewage
$2.$ Secondary treatment of sewage
$3.$ Anaerobic sludge digester
$4.$ Production of bioactive molecules

$Assertion (S)$: Ernest Chain and Howard Florey were awarded the Nobel Prize in $1948$.
$Reason (R)$: Lactic acid is produced by the fungus $Aspergillus$ $niger$.