In a herbarium, sheets are arranged according to

Options

A. regionally acceepted system of classification
B. Universally accepted system of classification
C. Nationally accepted system of classification
D. Locally accepted system of classification

Answer

### Step-by-Step Solution:

1. **Understanding Herbarium Sheets**:
- Herbarium sheets are collections of dried, pressed, identified, and classified plants. They serve as a reference for studying plant species.

2. **Components of Herbarium Sheets**:
- Each herbarium sheet contains various pieces of information about the plant, including:
- The scientific name (genus and species)
- Family name
- Local name
- Other relevant data (such as habitat, date of collection, collector's name, etc.)

3. **Classification System**:
- The arrangement of herbarium sheets is based on a classification system. This system helps in organizing the plant specimens systematically.

4. **Types of Classification Systems**:
- Classification systems can be:
- Locally accepted
- Regionally accepted
- Nationally accepted
- Universally accepted

5. **Correct Classification for Herbarium Sheets**:
- Among these options, the herbarium sheets are arranged according to a **universally accepted system of classification**. This ensures consistency and standardization across different regions and countries.

6. **Conclusion**:
- Therefore, the correct answer to the question is that in a herbarium, sheets are arranged according to the **universally accepted system of classification**.