Select the correct group of biocontrol agents.
- Oscillatoria, Rhizobium, Trichoderma
- Nostoc, Azospirillum, Nucleopolyhedrovirus
- Bacillus thuringiensis, Tobacco mosaic virus, Aphids
- Trichoderma, Baculovirus, Bacillus thuringiensis
Answer
(4) Trichoderma, Baculovirus, Bacillus thuringiensis
Solution
As per NCERT, the biocontrol agents described are:
• Bacillus thuringiensis (Bt) – bacterium used to control butterfly caterpillars
• Trichoderma – free-living fungus, effective against several plant pathogens
• Baculoviruses (genus Nucleopolyhedrovirus) – pathogens of insects and other arthropods
∵ Oscillatoria, Nostoc (cyanobacteria), Rhizobium and Azospirillum are biofertilisers, and Tobacco mosaic virus and aphids are plant pests/pathogens,
∴ the correct group is Trichoderma, Baculovirus, Bacillus thuringiensis.
Answer: (4)