NEET 2019 · BiologyPrevious Year Question

Select the correct group of biocontrol agents.

Answer: (B) Trichoderma, Baculovirus, Bacillus thuringiensis. Answer: (b) Trichoderma, Baculovirus, Bacillus thuringiensis Solution: All three are established microbial biocontrol agents — Trichoderma controls plant pathogens, Baculoviruses (Nucleopolyhedrovirus) attack insect pests, and Bacillus thuringiensis (Bt) kills caterpillars.

A.Bacillus thuringiensis, Tobacco mosaic virus, Aphids
B.Trichoderma, Baculovirus, Bacillus thuringiensis✓
C.Oscillatoria, Rhizobium, Trichoderma
D.Nostoc, Azospirillium, Nucleopolyhedrovirus

Correct Answer

(B) Trichoderma, Baculovirus, Bacillus thuringiensis

Solution & Explanation

Answer: (b) Trichoderma, Baculovirus, Bacillus thuringiensis Solution: All three are established microbial biocontrol agents — Trichoderma controls plant pathogens, Baculoviruses (Nucleopolyhedrovirus) attack insect pests, and Bacillus thuringiensis (Bt) kills caterpillars. The other options contain biofertilisers (Rhizobium, Nostoc, Anabaena, Azospirillum) or pests (Aphids), not a pure biocontrol set. NCERT Reference: Ch 8, p.157, line 34 — "Baculoviruses are pathogens that attack insects and other arthropods."

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