Eucaryotic cells devoid of E.R. are

Options

A. Liver cells
B. Kindey cells
C. Mature leucocytes
D. Mature erythrocytes.

Answer

To answer the question "Eukaryotic cells devoid of E.R. are," we need to analyze the options provided and identify which type of eukaryotic cell lacks the endoplasmic reticulum (E.R.).

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a type of eukaryotic cell that does not have an endoplasmic reticulum.

2. **Identify the Options**: The options provided are:
- Liver cells
- Kidney cells
- Mature mucocytes
- Mature erythrocytes

3. **Analyze Each Option**:
- **Liver Cells**: These cells are known to have a well-developed endoplasmic reticulum, as they are involved in various metabolic processes.
- **Kidney Cells**: Similar to liver cells, kidney cells also possess an endoplasmic reticulum for their functions in filtration and absorption.
- **Mature Mucocytes**: These cells may have some organelles, but they are not typically known for lacking E.R.
- **Mature Erythrocytes**: Mature red blood cells (RBCs) are unique among eukaryotic cells because they lose their nucleus and other organelles, including the endoplasmic reticulum, during maturation.

4. **Conclusion**: Based on the analysis, the correct answer is **Mature Erythrocytes**. These cells are eukaryotic but lack the endoplasmic reticulum.

### Final Answer:
Mature Erythrocytes (Red Blood Cells) are the eukaryotic cells devoid of endoplasmic reticulum.

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