A) In paddy fields, cyanobacteria serve as an important biofertiliser
B) Trichoderma are free livings that are seen in the shoot ecosystems
C) Baculoviruses (especially genus Nucleopolyhedro virus): Attack insects and other arthropods
D) Bacillus thuringiensis (Bt) to control butterfly caterpillar
Correct Answer: B
Solution :
[b] Trichoderma (fungus) are free living that are sen in root ecosystem. They are effective biocontrol agents of several plant pathogens.
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