A) Rhizobium
B) Nostoc
C) Mycorrhiza
D) Agrobacterium
Correct Answer: D
Solution :
Agrobacterium is a Gram negative bacterium that causes tumours in plants. It is well known for its ability to transfer DNA between itself and plants, and for this reason it has become an important tool for genetic engineering. A. tumefaciens causes crown-gall disease in plants. It has Ti-plasmid.
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