Question

What is true about Bt-toxin? (a) The concerned bacillus has antitoxins. (b) The inactive protoxin gets converted into active form in the insect gut (c) Bt-protein exists as active toxin in the bacillus. (d) The activated toxin enters the ovary of pest to sterilize it and thus prevent its multiplication.

Name: Problem 44, Chapter 12: Objective Biology for NEET
Uploaded: 2021-11-20T14:05:32-08:00
Duration: 1 min 17 s
Channel: Hast Aggarwal
Description: What is true about Bt-toxin? (a) The concerned bacillus has antitoxins. (b) The inactive protoxin gets converted into active form in the insect gut (c) Bt-protein exists as active toxin in the bacillus. (d) The activated toxin enters the ovary of pest to sterilize it and thus prevent its multiplication.

   What is true about Bt-toxin?
(a) The concerned bacillus has antitoxins.
(b) The inactive protoxin gets converted into active form in the insect gut
(c) Bt-protein exists as active toxin in the bacillus.
(d) The activated toxin enters the ovary of pest to sterilize it and thus prevent its multiplication.

Objective Biology for NEET

Rajiv Vijay 2nd Edition

Chapter 12, Problem 44

Instant Answer

Solved by Expert Hast Aggarwal

11/20/2021

Step 1

The statements given are: (a) The concerned bacillus has antitoxins. (b) The inactive protoxin gets converted into active form in the insect gut (c) Bt-protein exists as active toxin in the bacillus. (d) The activated toxin enters the ovary of pest to sterilize Show more…

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What is true about Bt-toxin? (a) The concerned bacillus has antitoxins. (b) The inactive protoxin gets converted into active form in the insect gut (c) Bt-protein exists as active toxin in the bacillus. (d) The activated toxin enters the ovary of pest to sterilize it and thus prevent its multiplication.

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Key Concepts

Protoxin Activation Mechanism

Bt toxins are synthesized as inactive protoxins, which require activation to become effective. When ingested by an insect, the alkaline conditions and specific gut proteases convert the protoxin into an active toxin. This active form then interacts with receptors in the insect’s midgut, leading to disruption of epithelial cell integrity and eventually causing the insect's death.

Bacillus thuringiensis (Bt) Toxin

Bacillus thuringiensis is a bacterium that produces insecticidal proteins and is widely used in agriculture for pest management. The toxin is effective specifically against certain insect larvae and forms crystalline inclusions during sporulation. Its specificity and safety to non-target organisms have made it a valuable biological pesticide.

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