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How does the toxin produced in Bt cotton kill the bollworm that feeds on the plant?
AIt dries up the plant's leaves first
BIt blocks the bollworm's eyesight
CIt freezes the bollworm's body fluids
DIt destroys the bollworm's alimentary canal
Answer & Solution
Correct answer: D. It destroys the bollworm's alimentary canal
1. The Bt gene makes the cotton leaves and bolls produce a toxin.
2. When the bollworm eats these parts, the toxin destroys its alimentary canal and the pest dies.
3. The toxin does not act on eyesight or freeze the pest, and it does not work by drying the leaves.
4. The trap of drying leaves confuses crop death with pest death, which is incorrect here.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 8 "Cell Biology and Biotechnology", p.101_
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