Q. Which one of the following is an example of carrying out biological control of pests/diseases using microbes ?
A) Lady bird beetle against aphids in mustard
B) Trichoderma sp. against certain plant pathogens
C) Nucleopolyhedrovirus against white rust in Brassica
D) Bt-cotton to increase cotton yield
Explanation
[Solution from source] Trichoderma is a free-living fungus used as a biocontrol agent against several plant pathogens, so it is microbial biocontrol. A ladybird beetle is an insect, not a microbe; nucleopolyhedrovirus is used against insect pests, not white rust; and Bt-cotton is a transgenic crop, not biocontrol. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.