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Assertion : Agrobacterium tumefaciens 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.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
If the Assertion is correct but Reason is incorrect.
If both the Assertion and Reason are incorrect.
Solution
A soil inhabiting, plant pathogenic bacteria Agrobacterium tumefaciens infects broad leaved crops including tomato, soyabean, sunflower and cotton but not the cereals. Tumour formation (crown galls) is induced by its plasmid $(Ti)$ into the chromosomal $DNA$ of its host plant. The $T-DNA$ causes tumors. As gene transfer occurs without human efforts the bacteria is known as natural genetic engineer of plants.
