Question

Given below are two statements:
Statement I: The T-DNA region of a naturally occurring (native) Ti plasmid of Agrobacterium tumefaciens contains genes for biosynthesis of plant hormones.
Statement II: The virulence genes of Agrobacterium tumefaciens are placed on a Helper Plasmid during development of a binary vector system for plant transformation.
In the light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is correct but Statement II is false
• D. Statement I is incorrect but Statement II is true

Hint:

• T-DNA → Hormone genes (tumor formation)
• Binary vector → vir genes on helper plasmid

Answer 1

The Correct Option is A

Concept: Agrobacterium tumefaciens uses the Ti plasmid to transfer T-DNA into plant cells.
• Native T-DNA contains genes for auxin and cytokinin synthesis → tumor formation
• In genetic engineering, this system is modified using binary vectors

Step 1: Evaluating Statement I.

• T-DNA region contains genes for plant hormone synthesis → True

Step 2: Evaluating Statement II.

• In binary vector system:
• T-DNA is on one plasmid
• Vir genes are provided on a helper plasmid → True

Step 3: Selecting the correct answer.
Thus, both statements are correct.