In the given figure,what do '$z$' and '$b$' represent respectively?

Choose the correct combination:

Column-$I$	Column-$II$
$A$. Escherichia coli	$I$. Nif gene
$B$. Rhizobium melilotae	$II$. Digestive hydrocarbon of crude oil
$C$. Bacillus thuringiensis	$III$. Production of human insulin
$D$. Pseudomonas putida	$IV$. Biological control of fungal disease
	$V$. Biodecomposed insecticide

Match the Column-$I$ with Column-$II$. Choose the correct option given below.

Column-$I$	Column-$II$
$A$. Streptococcus	$(i)$ Free living nitrogen fixing bacteria
$B$. Penicillium	$(ii)$ Clot buster
$C$. Methanogens	$(iii)$ Source of antibiotic
$D$. Anabaena	$(iv)$ Biogas production

Match the following columns:

Column-$I$	Column-$II$
$1.$ Silage	$a.$ Measure of water pollution level.
$2.$ Flocs	$b.$ Cattle feed.
$3.$ Biogas	$c.$ Bacteria associated with fungal filaments in water.
$4.$ $BOD$	$d.$ Anaerobic metabolism of organic waste.

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.

Which of the following is mismatched?