CBSE 2022 · Region 2 · Set 1 · Q12 · 3 marks
An application of biotechnology in agriculture involves production of pest resistant plants using 'cry' genes from a bacterium. Name the bacterium. Explain why the 'cry' gene kills the pest but not the bacterium itself.
Marking-scheme solution
Bacillus thuringiensis Bacillus thuringiensis forms protein crystals which exist as inactive toxin / protoxin, therefore do not kill it.
The ingested inactive toxin in insect gets solubilise / become active, due to alkaline pH of insect's gut thereby killing 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.