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Biology · 2026 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Agriculture3 marksUnderstandshort answer
CBSE 2026 · Region 1 · Set 1 · Q27
A farmer grew two varieties of corn crop in field A and B. He grew normal corn crops in field A and GM corn crops in field B. He observed that corn…
A farmer grew two varieties of corn crop in field A and B. He grew normal corn crops in field A and GM corn crops in field B. He observed that corn borers attacked only in field A. To control it, spores of Bt were sprayed on field A.
(a)
Name the gene in the spores responsible for control of pest.
(b)
What effect will the spores of Bt have on insect pest ?
(c)
How has corn plants of field B developed resistance against this pest? Explain.
Marking-scheme solution
(a)
Cry I Ab
(b)
The spores of Bt were mixed with water and sprayed in field A where these are eaten by the insect larvae, in the gut of the insect toxins are released, and insect get killed.
(c)
The genetically modified plants (GM) express Bt gene /produce Bt toxin which when ingested will kill the pest.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.