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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Agrobacterium tumefaciens is widely used as a vector to deliver desirable genes into a variety of plants. Reason (R): It naturally delivers a piece of DNA known as 'T-DNA' to transform normal plant cells into a tumor, and this property is exploited by using its disarmed plasmid as a vector. In the

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Correct answer

A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Step-by-step solution

Assertion (A) is true: Agrobacterium tumefaciens is considered a natural genetic engineer of plants and is extensively used as a cloning vector for introducing genes into dicot plants. Reason (R) is true: In nature, it infects plants and transfers a segment of its Ti (tumor-inducing) plasmid, called T-DNA, which directs normal plant cells to become tumor cells (crown gall). Biotechnologists have modified this Ti plasmid by removing the tumor-causing genes (disarming it) while retaining its ability to transfer DNA.

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