CBSE 2025 · Region 2 · Set 3 · Q27 · 3 marks
An application of biotechnology in agriculture involves the production of pest resistant plants, using "cry" gene from a bacterium, Bacillus thuringiensis.(a)Proteins coded by which specific Bt. toxin gene control corn borer ?(b)How does Bt. toxin produced by the bacterium kill the insect ? Explain.
An application of biotechnology in agriculture involves the production of pest resistant plants, using "cry" gene from a bacterium, Bacillus thuringiensis.
(a)
Proteins coded by which specific Bt. toxin gene control corn borer ?
(b)
How does Bt. toxin produced by the bacterium kill the insect ? Explain.
Marking-scheme solution
(a) cryIAb
(b) The ingested inactive toxin in insect get solubilise / become active due to alkaline pH of insect's gut.
It binds to the surface of midgut epithelial cells and perforate the walls, causes cell swelling, lysis and ultimately kill the insect.Biotechnology and its ApplicationsBiotechnological Applications in AgricultureUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.