Which of the following kingdoms has no well defined boundaries?

Options

A. monera
B. Protista
C. Fungi
D. None of these

Explanation

To solve the question "Which of the following kingdoms has no well-defined boundaries?" we can follow these steps:

### Step 1: Understand the Five Kingdom Classification
The five kingdom classification system includes the kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. Each kingdom has its own characteristics and classifications.

### Step 2: Analyze the Options
The options given are:
- Monera
- Protista
- Fungi
- None of these

### Step 3: Identify Characteristics of Each Kingdom
- **Monera**: This kingdom includes prokaryotic organisms like bacteria, which have well-defined characteristics.
- **Protista**: This kingdom includes a diverse group of mostly unicellular eukaryotic organisms. They have a wide variety of forms and functions.
- **Fungi**: This kingdom includes multicellular organisms (like mushrooms) and unicellular organisms (like yeast) that have defined characteristics.
- **None of these**: This option implies that all the kingdoms listed have well-defined boundaries.

### Step 4: Determine the Kingdom with No Well-Defined Boundaries
Among the options, **Protista** is known for its diversity and lack of well-defined boundaries. The organisms in this kingdom can vary greatly in form and function, and they can be unicellular or form colonies. They also have different modes of nutrition and reproduction, which contributes to their undefined boundaries.

### Step 5: Conclusion
Based on the analysis, the kingdom that has no well-defined boundaries is **Protista**.

### Final Answer
The correct option is **B) Protista**.

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