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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 cloning vector for delivering desirable genes into plant cells. Reason (R): The Ti plasmid of Agrobacterium is disarmed to eliminate its pathogenicity while retaining its ability to transfer DNA into the host plant. In the light of the above statements,

Options

  1. ABoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  2. BAssertion (A) is true but Reason (R) is false
  3. CAssertion (A) is false but Reason (R) is true
  4. DBoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Correct answer

D. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Step-by-step solution

Assertion (A) is true because Agrobacterium tumefaciens is extensively used as a natural genetic engineer to deliver genes of interest into several dicot plants. Reason (R) is true and correctly explains the Assertion. In nature, Agrobacterium delivers a piece of DNA (T-DNA) that causes crown gall tumors. For biotechnological applications, the tumor-inducing (Ti) plasmid is modified into a cloning vector. The disease-causing genes are removed (disarmed) so it is no longer pathogenic, but it retains the mechanism to

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