Which was the first commercially developed insecticide?

The latest trend in plant disease control is:

Consider the following statements:
$I.$ Ladybirds and dragonflies are used to get rid of aphids and mosquitoes.
$II.$ The bacteria $Bacillus$ $thuringiensis$ $(Bt)$ are used to control butterfly caterpillars.
$III.$ $Trichoderma$ $sp.$,free-living fungi,are present in root ecosystems where they act against several plant pathogens.
$IV.$ $Rhizobium$ is a symbiotic bacterium that lives in the stem of legumes.
Which of the statements given above are correct?

The species of genetically engineered microorganism that is successfully used in the bioremediation of oil is .........

Baculoviruses are pathogens that attack which of the following organisms?

Match the following columns correctly:

Column-$I$	Column-$II$	Column-$III$
$(a)$ $B.T.$ bacteria	$(p)$ Free-living fungi	$(i)$ Arthropods
$(b)$ Trichoderma	$(q)$ Bionematicides	$(ii)$ Cereal crops
$(c)$ Baculovirus	$(r)$ Cotton	$(iii)$ Crop-sucking pests
$(d)$ Pseudomonas	$(s)$ Symbiotic fungi	$(iv)$ Nematodes
	$(t)$ Quantum-$4000$	$(v)$ Crop disease control
	$(u)$ Biological control