The branch of biology which deals with improvement of plant variety

Options

A. Eugenics
B. Plant breeding
C. Agrology
D. Serendipity

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the branch of biology that focuses on improving plant varieties.

2. **Analyzing the Options**:
- **Eugenics**: This is related to improving the human species, not plants.
- **Plant Breeding**: This involves the selective breeding of plants to enhance desired traits such as yield and disease resistance.
- **Agrology**: This is the application of science to agriculture in general, not specifically focused on plant variety improvement.
- **Serendipity**: This term refers to accidental discoveries, which does not pertain to the systematic improvement of plant varieties.

3. **Identifying the Correct Answer**: Based on the definitions and focus of each option, the correct answer is **Plant Breeding** (Option B), as it specifically deals with the improvement of plant varieties.

4. **Conclusion**: The branch of biology that deals with the improvement of plant variety is **Plant Breeding**.