RE-NEET 2024 Zoology Bt Cotton MCQ Question
Following are the steps involved in action of toxin in Bt. Cotton
A. The inactive toxin converted into active form due to alkaline pH of gut of insect.
B. Bacillus thuringiensis produce crystals with toxic insecticidal proteins.
C. The alkaline pH solubilises the crystals.
D. The activated toxin binds to the surface of midgut cells, creates pores and causes death of the insect.
E. The toxin proteins exist as inactive protoxins in bacteria.
E → C → B → A → D
B → C → A → E → D
A → E → B → D → C
B → E → C → A → D
Correct Answer
Detailed Explanation
The correct sequence is: Bacillus thuringiensis produces crystals, the toxin proteins exist as inactive protoxins, the alkaline pH solubilises the crystals, the inactive toxin is converted into active form, and the activated toxin binds to the surface of midgut cells causing death.
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