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Biology · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 3 · Q24
Explain how the following microbes act as biocontrol agents: (a) Bacillus thuringiensis (b) Nucleopolyhedrovirus
Explain how the following microbes act as biocontrol agents :
(a)
Bacillus thuringiensis
(b)
Nucleopolyhedrovirus
Marking-scheme solution
(a)
When spores of these bacteria which have inactive toxin is mixed with water and sprayed on plants, it becomes active in the gut of pest and kills it.
(b)
They have species specific narrow-spectrum insecticidal applications and are the pathogens that attack insects pests and other arthropods.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.