A) Bacillus coagulens
B) Agrobacterium tumefaciens
C) Costridium septicum
D) Xanthomonas citri
Correct Answer: B
Solution :
[b] Agrobacterium tumefaciens is a plant pathogen that causes a disease of plants called crown gall. The tumour like gall grows when A tumefaciens inserts a plasmid (Ti plasmid), containing bacterial genetic information, into the plant's chromosomal DNA. So, for this reason, this bacterium has been extensively used as vector for gene transfer to plant cells.
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