What is true about Bt toxin?

(A)Bt protein exists as active toxin in the Bacillus.
(B)The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
(C)The concerned Bacillus has antitoxins.
(D)The inactive protoxin gets converted into active form in the insect gut.

The NCERT line that answers it

Verbatim line

Actually, the Bt toxin protein exist as inactive *protoxins* but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.

Chapter: Biotechnology and its Applications
Section: 10.1 BIOTECHNOLOGICAL APPLICATIONS IN AGRICULTURE
Page: 2
Words matched: 38 of 38

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that Bt toxin exists as inactive protoxins and is converted to active form in the insect gut due to alkaline pH, which directly matches option D's claim.

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