A) Trichoderma sp. against certain plant pathogens
B) Nucleopolyhedrovirus against white rust in Brassica
C) Bt-cotton to increase cotton yield
D) Lady bird beetle against aphids in mustard
Correct Answer: C
Solution :
Bt cotton is Genetically Modified (GM) cotton which has an incorporated gene extracted from the bacterium Bacillus thuringiensis. This gene codes for Bt toxin in plant tissues which is harmful only to a small fraction of insects, most notably the larvae of lepidopterans, -moths, butterflies, beetles, flies, etc and harmless to other forms of life. So, it is used as biological control of pests/diseases.
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