Which of the following can be used as a biocontrol agent in the treatment of plant disease?

$Trichoderma$ is a . . . . . . .

Which fish is used to control mosquitoes by feeding on their larvae?

The microbe used for the biocontrol of pest butterfly caterpillars is:

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.

In India, the most popular bioinsecticide is the extract from