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  1. Which of the following bacterium causes crown gall disease in plants?

    2. A.

     Bacillus thurigiensis
    B.

     Agrobacterium tumefaciens
    C.

     Pseudomonas fluorescens
    D.

     None of these

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    Answer : Option B

    Explanation :

    Crown gall is caused by the bacterial plant pathogen, Agrobacterium tumefaciens. Crown gall bacteria enter plant roots through wounds.

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