single - celled eukaryotes are included in

Options

A. Portista
B. fungi
C. Archaea
D. Monera

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the classification of single-celled eukaryotes.

2. **Defining Key Terms**:
- **Single-celled**: Organisms that consist of only one cell, also known as unicellular organisms.
- **Eukaryotes**: Organisms whose cells have a well-defined nucleus enclosed by a nuclear membrane, along with various cell organelles.

3. **Identifying the Classification**:
- In biological classification, organisms are grouped into kingdoms. One of the classifications is based on the number of cells and the type of cells (prokaryotic vs. eukaryotic).
- The five kingdoms proposed by R.H. Whittaker are Monera, Protista, Fungi, Plantae, and Animalia.

4. **Analyzing the Options**:
- **Option 1: Protista**: This kingdom includes unicellular eukaryotes. Therefore, it fits the description of single-celled eukaryotes.
- **Option 2: Monera**: This kingdom consists of prokaryotic organisms (bacteria), which are not eukaryotes.
- **Option 3: Fungi**: While fungi are eukaryotic, they are primarily multicellular (with some exceptions like yeast, which are unicellular but not the main classification).
- **Option 4: Plantae and Animalia**: These kingdoms consist of multicellular organisms.

5. **Conclusion**: Based on the analysis, the correct classification for single-celled eukaryotes is **Protista**.

**Final Answer**: Single-celled eukaryotes are included in **Protista**.

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