Which of the following is an incorrectly matched pair?

One of the useful activities of several bacteria is

Which one of the following statements is correct:
$(i)$ Baculoviruses are excellent candidates for species-specific,narrow-spectrum insecticidal applications.
(ii) Bacillus thuringiensis is used to control butterfly caterpillars.
(iii) Ladybird is useful to get rid of mosquitoes.
(iv) Trichoderma fungus is used as a biocontrol agent for animal pathogens.

Identify the odd group out.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Flocs	$(1)$ Biocontrol agent
$(b)$ Methanobacterium	$(2)$ Biological treatment
$(c)$ Ladybird	$(3)$ Biofertilizer
$(d)$ Cyanobacteria	$(4)$ Biogas production

Match the following columns:

Column $I$	Column $II$
$1.$ $LAB$	$a.$ Quantum $-4000$
$2.$ $Propionibacterium$ $shermanii$	$b.$ Free-living $N_2$-fixer
$3.$ $Acetobacter$ $aceti$	$c.$ Lactic acid production
$4.$ $Clostridium$ $butylicum$	$d.$ Swiss cheese
$5.$ $Pseudomonas$	$e.$ Biogas
$6.$ $Azospirillum$	$f.$ Acetic acid
	$g.$ Butyric acid