Cell wall is present in

Options

A. Plant cells
B. Prokaryotic cell
C. Fungi cells
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the Classification of Organisms**:
- Organisms are classified into five kingdoms according to R. H. Whittaker's classification system: Monera, Protista, Fungi, Plantae, and Animalia.
- Among these, most groups (except for Protozoans in Protista) possess a cell wall.

2. **Identifying Organisms with Cell Walls**:
- **Plant Cells**:
- Plant cells belong to the kingdom Plantae and have a cell wall primarily made of cellulose, which provides structural support.
- **Prokaryotic Cells**:
- Prokaryotic cells fall under the kingdom Monera. They also have a cell wall, which is composed of polysaccharides and amino acids.
- **Fungi Cells**:
- Fungi belong to the kingdom Fungi and possess a cell wall made of chitin, which is different from the cellulose found in plant cells.

3. **Exclusion of Protozoans**:
- Protozoans, which are part of the Protista kingdom, do not have a cell wall. Instead, they have a flexible protein-rich layer called pellicle.

4. **Conclusion**:
- Based on the analysis, cell walls are present in plant cells, prokaryotic cells, and fungi cells. Therefore, the correct answer is that the cell wall is present in all these three categories.

### Final Answer:
Cell wall is present in:
- Plant cells
- Prokaryotic cells
- Fungi cells
- **All of the above**

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