Addition of foreign gene into a crop is

Options

A. Genetic engineering
B. Biotechnology
C. Tissue culture
D. Immunisation

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the process of adding a foreign gene into a crop. This involves manipulating the genetic material of the plant.

2. **Identifying the Process**: The process of adding a foreign gene into an organism is commonly referred to as genetic engineering. This is a key technique in biotechnology.

3. **Role of Vectors**: In genetic engineering, a vector is used to transfer the foreign gene into the plant. Vectors can be plasmids, viruses, or other methods that facilitate the introduction of the desired gene.

4. **Result of the Process**: Once the foreign gene is successfully integrated into the plant's genome, the plant is referred to as a genetically modified organism (GMO) or genetically modified crop. This crop will express the traits associated with the inserted gene.

5. **Conclusion**: Therefore, the addition of a foreign gene into a crop is best described as genetic engineering.

**Final Answer**: The addition of a foreign gene into a crop is genetic engineering.

---