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NEET 2020 · BiologyPrevious Year Question

Bt cotton variety that was developed by the introduction toxin gene of Bacillus thuringiensis (bt) is resistant to:

Answer: (C) Insect pest. Answer: (C) Insect pest Solution: The Bt toxin gene cloned from Bacillus thuringiensis is expressed in cotton to make it resistant to insect pests (chiefly lepidopteran bollworms), acting as a built-in bio-pesticide.

  1. A.Plant nematodes
  2. B.Insect predators
  3. C.Insect pest✓
  4. D.Fungal diseases

Correct Answer

(C) Insect pest

Solution & Explanation

Answer: (C) Insect pest Solution: The Bt toxin gene cloned from Bacillus thuringiensis is expressed in cotton to make it resistant to insect pests (chiefly lepidopteran bollworms), acting as a built-in bio-pesticide. It does not confer resistance to nematodes (that is the RNAi strategy) or to fungal diseases, and 'insect predators' are beneficial, not the target. NCERT Reference: Ch 10, p.179, line 035 — "resistance to insects without the need for insecticides; in effect created a"

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