Which of the following is essential to avoid environmental pollution?

Identify the odd one out.

One of the useful activities of several bacteria is

Which one of the following pairs is wrongly matched?

Which of the following is correctly matched?

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.