A) Altering the pH of soil, then heat-socking the plants.
B) Exposing the plants to cold for a brief period
C) Allowing the plant roots to stand in water.
D) Infection of the plant by Agrobacterium tumefaciens.
Correct Answer: D
Solution :The tumour inducing (Ti) plasmid of Agrobacterium tumifaciens has now been modified into a cloning vector which is no more pathogenic to the plants but is still able to use the mechanisms to deliver genes of our interest into a variety of plants. Hence, the correct option is [d].
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