Which fish is useful for the biological control of mosquitoes?

Given below are two statements.
Statement $I$: Baculoviruses are pathogens that attack nematodes.
Statement $II$: Baculoviruses are used as biological control agents in ecologically sensitive areas as they are species-specific in their action.
In the light of the above statements, choose the correct answer from the options given below.

Which microorganism is used to control pests that are harmful to cotton?

Select the appropriate option regarding $Trichoderma$.

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?