Name the vector used for introducing gene for hirudin into Brassica napus seed plant.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the vector used to introduce the gene for hirudin into the Brassica napus plant.

2. **Defining a Vector**: A vector is a DNA molecule used to carry foreign genetic material into another cell. It acts as a vehicle for gene transfer.

3. **Identifying the Type of Vector**: In the context of plant biotechnology, one of the most common vectors used is the Ti plasmid (Tumor-inducing plasmid) from the bacterium Agrobacterium tumefaciens.

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