Answer:
A. tumefaciens contains Ti plasmid which induces tumour formation in infected plants and such tumours are called crown galls. The Ti plasmid has been modified into cloning vectors and it helps in transferring desirable genes into various plants. A. tumefaciens is also called natural genetic engineer of plants since these bacteria have natural ability to transfer T - DNA of their plasmid into plant genome. T - DNA convert normal cells into tumour cells and direct them to produce chemicals required by the pathogen. If any desired gene is linked with Ti plasmid, desired chemical will be produced.
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