Q. Assertion : Agrobacterium lumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.
Reason : A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the crop with which the bacterium is associated.

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Solution:

Agrobacterium tumefaciens infects certain plants in which plasmid (not chromosomal genome) causes the formation of tumour like growth called a crown gall. Agrobacterium does not infect grasses (i.e., cereals).