A) infection of the plant by Agrobacterium tumefaciens
B) altering the pH of soil, heat-shocking the plants
C) exposing the plants to cold for a brief period
D) allowing the plant roots to stand in water
Correct Answer: A
Solution :
Agrobacterium tumefaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as tDNA to transform normal plant cells into a tumour and direct these tumour cells to produce the chemicals required by the pathogen.
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