NCERT Class 12 Biology — Why does Bt toxin not kill the ba

NCERT · Class 12 · Biology · Biotechnology and its ApplicationsWhy does Bt toxin not kill the bacterium Bacillus thuringiensis that produces it?

Step-by-Step Solution

Bt toxin protein exists as inactive protoxins in the bacterium. Once an insect ingests the inactive toxin, it is converted into an active form due to the alkaline pH of the gut, which solubilizes the crystals. Therefore, inside the neutral or acidic environment of the bacterium, it remains inactive and harmless.

Detailed Options Breakdown

Option : The bacterium has a special immune system

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Biotechnology and its Applications.

Option 1: The toxin is produced in an inactive form called protoxin (Correct Answer)

Correct choice. Refer to the step-by-step verified solution guidelines above for details.

Option 2: The bacterium destroys the toxin immediately

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Biotechnology and its Applications.

Option 3: The toxin is localized only in the cell wall

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Biotechnology and its Applications.

💡 Study Guide: This question tests core syllabus concepts from Biotechnology and its Applications. For formulas, key summaries, and mock exam reference guides, read the full Biotechnology and its Applications Revision Notes.

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