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(A) The bacterium $Bacillus \ thuringiensis$ (often abbreviated as $Bt$) is widely used as a biological control agent.It produces a specific insectici

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Bacillus thuringiensis

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(A) The bacterium $Bacillus \ thuringiensis$ (often abbreviated as $Bt$) is widely used as a biological control agent.It produces a specific insecticidal protein (Cry protein) that is toxic to certain insect larvae,such as those of butterflies and moths,which are common pests in fruit trees and crops.When these larvae ingest the bacterial spores,the toxin is activated in their gut,leading to their death while remaining harmless to other organisms.

Which bacterium is used to control harmful pests in fruit trees?

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