alleryThe Bt protoxin becomes an active toxin because the insect gut is:
AAcidic
BNeutral
CAnoxic
DAlkaline
Answer & Solution
Correct answer: D. Alkaline
1. The crystal has to dissolve before it can act.
2. The gut of the insect is alkaline.
3. That alkaline pH solubilises the crystals.
_Source: syllabus Biology, Ch 10 'Biotechnology and its Applications'_
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