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Topic: Applications in agriculture: GMOs, Bt crops· Biotechnology and Its Applications

Given below are two statements:Statement I : Bt toxins are insect group specific and coded by a gene cry IAc.Statement II : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets co…

Given below are two statements:

Statement I : Bt toxins are insect group specific and coded by a gene cry IAc.

Statement II : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut.

In the light of the above statements, choose the correct answer from the options given below:

1. Statement I is false but Statement II is true

2. Both Statement I and Statement II are true

3. Both Statement I and Statement II are false

4. Statement I is true but Statement II is false

1 answer

Best answer

Answer: 4. Statement I is true but Statement II is false

Key idea: Bt toxin is specific to insect groups, and the protoxin is activated in an alkaline gut.

  • Statement I: Bt toxins are group specific (e.g. cryIAc against cotton bollworms). True.
  • Statement II: Protoxin is converted to active toxin by the alkaline pH of the insect gut, not acidic. False.

So Statement I is true and Statement II is false.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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