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BotanyNEET 2024Applications in agriculture: Bt crops, RNAi

Biotechnology and its Applications

Given below are two statements:

Statement I: Bt toxins are insect-group specific and coded by a gene cryIAc.

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

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

  1. A.Both Statement I and Statement II are false
  2. B.Statement I is true but Statement II is false✓
  3. C.Statement I is false but Statement II is true
  4. D.Both Statement I and Statement II are true

Solution

Bt toxins are indeed insect-group specific and encoded by cry genes (Statement I true). The inactive protoxin is activated by the alkaline pH of the insect gut, not acidic — Statement II is false.

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