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Microbe used for biocontrol of pest butterfly caterpillars is

1. Trichoderma sp.
2. Saccharomyces cerevisiae
3. Bacillus thuringiensis
4. Streptococcus sp.

Correct answer: Bacillus thuringiensis

Solution

Bacillus thuringiensis (Bt) produces crystal proteins that are toxic to many insect larvae, especially butterfly and moth caterpillars. These proteins are widely used as a biological control agent in agriculture.

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