In rapidly dividing cells, endoplasmic reticulum is

Options

A. Non - functianl
B. Poorly devloped
C. Absent
D. Highly develped

Answer

### Step-by-Step Solution:

1. **Understanding Endoplasmic Reticulum (ER)**:
- The endoplasmic reticulum (ER) is a membrane-bound organelle found in eukaryotic cells. It plays a crucial role in the synthesis of proteins and lipids.

2. **Types of Endoplasmic Reticulum**:
- The ER is categorized into two types:
- **Rough Endoplasmic Reticulum (RER)**: This type has ribosomes on its surface, giving it a "rough" appearance. It is primarily involved in protein synthesis.
- **Smooth Endoplasmic Reticulum (SER)**: This type lacks ribosomes and is involved in lipid synthesis.

3. **Function of ER in Rapidly Dividing Cells**:
- In rapidly dividing cells, such as meristematic cells, the demand for protein and lipid synthesis is high. However, the structure of the ER in these cells is not fully developed.

4. **Development of ER in Rapidly Dividing Cells**:
- In rapidly dividing cells, the endoplasmic reticulum is **poorly developed**. This means that while it is present, it does not have the extensive structure or functionality seen in more differentiated cells.

5. **Conclusion**:
- Based on the analysis, the correct answer to the question is that in rapidly dividing cells, the endoplasmic reticulum is **poorly developed**.

### Final Answer:
The endoplasmic reticulum in rapidly dividing cells is **poorly developed** (Option 2).

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