(A]: Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.
[R]: A gene incorporated in the bacterial chro- mosomal genome gets automatically trans- ferred to the crop with which the bacterium is associated

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark a
B. lf both Assertion & Reason are true but the reason is no t the correct explanation of the assertion, then mark b
C. If Assertion is true statement but Reason is false, then mark c
D. If both Assertion and Reason are false statements, then mark d.

Answer

D

Explanation

Agrobacterium tumefacines is a gram negative non sporing, motile, rod shaped bacterium, closely related to Rhizobium. It is found commonly on and around room surfaces. The region termed rhizosphere where it seems to survive by using nutrients that leak from the room tissues. But it infects only through the wound-site eithen naturally occurring or caused by transplanting of seeding and nursery stock. It is harmful to plants and useful to scientists for the same reason i.e. it transfers DNA into plants genomes found in soil worldwide. A tumefaciens cause crown gall disease of wide range of dicot (broac leaved) plants especially members of rose family by transferring its own DNA into plant cells. But in laboratory, the ability to move all sorts of genes into plants has made the microbe the standard tool form investigating plant geneties and modifying crops.