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The insect-resistance gene used in Bt crops comes from the bacterium:

  • A Agrobacterium tumefaciens
  • B Bacillus thuringiensis
  • C Escherichia coli
  • D Rhizobium leguminosarum

Correct answer: B. Bacillus thuringiensis

Explanation: Bacillus thuringiensis produces the Cry proteins (Bt toxin); its cry genes are introduced into crops like Bt cotton.

Concept context

GM crops, transgenic animals, gene therapy, molecular diagnostics, and bioethics. Frequent 2–3 mark questions in NEET.

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