Agrobacterium tumefaciens contains a larger plasmid, which induces tumour in the plants it is termed as

Options

A. Ti plasmid
B. Ri plasmid
C. Recombinant plasmid
D. Shine Delgrano sequence

Answer

**Step-by-Step Solution:**

1. **Understanding Agrobacterium tumefaciens**:
- Agrobacterium tumefaciens is a soil bacterium known for its ability to transfer DNA to plants. This process is significant in biotechnology, especially in genetic engineering.

2. **Identifying the Plasmid**:
- The larger plasmid present in Agrobacterium tumefaciens is known as the Ti plasmid. Ti stands for "tumor-inducing."

3. **Function of the Ti Plasmid**:
- The Ti plasmid is responsible for inducing tumor formation (crown gall disease) in dicot plants. It integrates a segment of its DNA (T-DNA) into the plant's genome, leading to uncontrolled cell division and tumor formation.

4. **Biotechnological Application**:
- The Ti plasmid is not only responsible for tumor induction but is also utilized as a vector in genetic engineering. Scientists can insert desired genes into the Ti plasmid, which can then be transferred to the plant cells, allowing for the modification of plant traits.

5. **Conclusion**:
- Therefore, the larger plasmid in Agrobacterium tumefaciens that induces tumors in plants is termed the **Ti plasmid**.

**Final Answer**: The larger plasmid that induces tumors in plants is termed the **Ti plasmid**.

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