CBSE 2022 · Region 2 · Set 3 · Q12 · 3 marks
An application of biotechnology in agriculture involves production of pest resistant plants using 'cry' genes from a bacterium, Bacillus thuringiensis.(a)Proteins coded by which specific Bt toxin genes control corn borer ?(b)How does Bt toxin produced by the bacteria kill the insect ? Explain.
An application of biotechnology in agriculture involves production of pest resistant plants using 'cry' genes from a bacterium, Bacillus thuringiensis.
(a)
Proteins coded by which specific Bt toxin genes control corn borer ?
(b)
How does Bt toxin produced by the bacteria 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 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.