NEET 2012 Biology question

Which one of the following is an example of carrying out biological control of pests/diseases using microbes ?

(1)Lady bird beetle against aphids in mustard
(2)Trichoderma sp. against certain plant pathogensCorrect
(3)Nucleopolyhedrovirus against white rust in Brassica
(4)Bt-cotton to increase cotton yield

Answer: (2)

Solution

Biological control uses living organisms to suppress pests or pathogens. Trichoderma is a free-living fungus that is a biocontrol agent against several plant pathogens (it is effective against root diseases), so (2) is a case of biocontrol using a microbe. (1) Ladybird beetle is an insect predator

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Question ID VK-091196