Statement I: Activation of Bt protoxins in insect gut is due to the acidic pH of the gut which solubilize the crystals.
Statement II: The activated toxin binds to the surface of mid gut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.
Text Solution
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Statement I: Incorrect
Bt protoxin is activated in the insect gut due to the alkaline pH of the gut, not acidic pH . The alkaline medium solubilizes the crystal proteins and activates the toxin.
Statement II: Correct
The activated Bt toxin binds to receptors on the midgut epithelial cells, forms pores in the cell membrane, causing cell swelling, lysis, and ultimately death of the insect.
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