Following are the steps involved in action of toxin in Bt. Cotton Choose the correct sequence of steps from the options given below:
- E C B A D
- B C A E D
- A E B D C
- B E C A D
Answer
(4) B E C A D
Solution
B. Bacillus thuringiensis forms protein crystals containing the insecticidal protein.
E. In the bacterium, these proteins exist as inactive protoxins.
C. When the insect eats them, the alkaline pH of its gut solubilises the crystals.
A. The inactive toxin is converted into the active form.
D. The activated toxin binds to the surface of midgut epithelial cells, creates pores and causes death of the insect.
Sequence: B E C A D
Answer: (4)