One of the following is not eukaryotic

Options

A. Protista
B. Monera
C. Plantae
D. Animalia.

Answer

To determine which of the following options is not eukaryotic, we will analyze each option based on the definitions of prokaryotes and eukaryotes.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Eukaryotic Cells**: These cells have a defined nucleus enclosed by a nuclear membrane and contain membrane-bound organelles. They can be unicellular or multicellular.
- **Prokaryotic Cells**: These cells do not have a defined nucleus; their genetic material is not enclosed within a membrane. They are typically unicellular.

2. **Evaluate the Options**:
- **Option 1: Protista**: This kingdom consists of unicellular eukaryotes. Examples include diatoms and protozoans. Therefore, Protista is eukaryotic.
- **Option 2: Monera**: This kingdom includes all bacteria, which are prokaryotic organisms. They lack a defined nucleus and membrane-bound organelles. Therefore, Monera is not eukaryotic.
- **Option 3: Plantae**: This kingdom consists of multicellular eukaryotes, such as plants. Therefore, Plantae is eukaryotic.
- **Option 4: Animalia**: This kingdom consists of multicellular eukaryotes, such as animals. Therefore, Animalia is eukaryotic.

3. **Identify the Correct Answer**:
- Based on the analysis, the only option that is not eukaryotic is **Monera**.

### Final Answer:
The option that is not eukaryotic is **Monera**.

---