Mark the option that fill in the blanks suitably :
Using ________ vectors, nematode-specific genes were introduced into the host plant for pest resistance.

Options

A. Streptococcus
B. Bacillus anthracis
C. Agrobacterium
D. Haemophilus influenzae

Answer

To fill in the blank in the question, we need to identify the appropriate vector used for introducing nematode-specific genes into host plants for pest resistance.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a type of vector that can be used to introduce nematode-specific genes into a host plant for the purpose of pest resistance.

2. **Identifying the Options**: The options provided are:
- Streptococcus
- Bacillus anthracis
- Agrobacterium
- Haemophilus
- Influenza

3. **Analyzing Each Option**:
- **Streptococcus**: This is a genus of bacteria that is not typically used as a vector in genetic engineering.
- **Bacillus anthracis**: This is the bacterium that causes anthrax and is not suitable for use as a vector for plant genetic engineering.
- **Agrobacterium**: Specifically, Agrobacterium tumefaciens is well-known for its ability to transfer DNA to plant cells and is commonly used as a vector in plant biotechnology.
- **Haemophilus**: This is another genus of bacteria that does not serve as a vector for plant genetic engineering.
- **Influenza**: This is a virus that affects animals and humans, not plants, and is not used as a vector for introducing genes into plants.

4. **Choosing the Correct Answer**: Given the analysis, the only suitable option for introducing nematode-specific genes into host plants for pest resistance is **Agrobacterium**.

5. **Final Answer**: Using **Agrobacterium** vectors, nematode-specific genes were introduced into the host plant for pest resistance.