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Biology · 2023 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Agriculture3 marksUnderstandshort answer
CBSE 2023 · Region 5 · Set 1 · Q27
On spraying Bacillus thuringiensis on an infected cotton crop field the pests are killed by the toxin, however the toxin although produced by the…
On spraying Bacillus thuringiensis on an infected cotton crop field the pests are killed by the toxin, however the toxin although produced by the bacteria does not affect it. Explain giving reason.
Marking-scheme solution
In bacteria toxin is produced in inactive form/protoxin, insect ingests it, protoxin/inactive protein becomes active due to alkaline pH of gut (solubilize), toxin binds to epithelial cells (of midgut) and creates pores, causes swelling, lysis and death.
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.