CBSE 2022 · Region 3 · Set 1 · Q9 · 3 marks
What are cry-proteins ? With the help of a suitable example, explain how it acts as a biological pesticide.
Marking-scheme solution
Toxic insecticidal proteins/ pro-toxin /crystal proteins produced by cry genes of Bacillus thuringiensis.
e.g., in Bt Cotton / Bt corn/rice / tomato/ soyabean
Bt toxin protein exists as inactive protoxins, which get activated inside the alkaline pH of the gut of insect, causes perforations / swelling / lysis of midgut ultimately 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.