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Biology · 2024 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Agriculture3 marksUnderstandshort answer
CBSE 2024 · Region 3 · Set 1 · Q27
(a) Give the scientific name of the bacteria widely used in biotechnology to create a GM cotton crop resistant to bollworm attacks. (b) Explain how…
(a)
Give the scientific name of the bacteria widely used in biotechnology to create a GM cotton crop resistant to bollworm attacks.
(b)
Explain how GM cotton crop is able to resist insect attacks.
Marking-scheme solution
(a)
Bacillus thuringiensis
(b)
GM cotton crop contains Bt toxin protein which exists as inactive protoxins, but once
bollworm ingest the inactive toxin it is converted into an active form due to the alkaline pH of the gut of the worm, which solubilizes the crystals of the prototoxin, activated toxin binds to the surface of the midgut epithelial cells of the worm and creates pores that cause swelling and lysis and death of the insect caterpillar.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.