Which one of the following is a case of wrong matching?

Options

A. Somatic hybridization - Fusion of two diverse cells
B. Vector DNA - Site for t RNA synthesis
C. Micropropagation - in vitro production of plants in large numbers
D. Callus - Unorganised mass of cells

Answer

To solve the question of which one of the following is a case of wrong matching, we will analyze each option provided.

### Step 1: Analyze the first option - Somatic Hybridization
- **Definition**: Somatic hybridization refers to the fusion of genetically dissimilar somatic cells (non-reproductive cells).
- **Evaluation**: This definition is accurate. Therefore, this option is a correct match.

### Step 2: Analyze the second option - Vector DNA
- **Definition**: Vector DNA is a carrier DNA molecule that contains foreign DNA and is used to transfer genetic material into another cell.
- **Evaluation**: The statement "vector DNA site for tRNA synthesis" is incorrect because vector DNA does not serve as a site for tRNA synthesis. Thus, this option is a wrong match.

### Step 3: Analyze the third option - Micropropagation
- **Definition**: Micropropagation is a technique used for the vegetative propagation of plants, allowing for the rapid production of plantlets in a controlled environment.
- **Evaluation**: This definition is correct. Hence, this option is a correct match.

### Step 4: Analyze the fourth option - Callus
- **Definition**: A callus is defined as a mass of undifferentiated cells formed from the continuous division of meristematic cells.
- **Evaluation**: This definition is also accurate. Therefore, this option is a correct match.

### Conclusion
After analyzing all options, the only incorrect match is the second option regarding vector DNA.

**Final Answer**: The case of wrong matching is the second option: "Vector DNA - site for tRNA synthesis."

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