Simple epithelium is not effective in

Options

A. Nutrition
B. Excretion
C. Secretion
D. Protecting the underlying tissues

Answer

### Step-by-Step Solution:

1. **Understanding Epithelium Tissue**:
- Epithelium is a type of tissue that covers the surfaces of the body, both inside and out. It consists of layers of cells that are tightly packed together.

2. **Types of Epithelium**:
- Epithelium is classified into two main types: simple epithelium and compound epithelium.
- Simple epithelium is a single layer of cells, while compound epithelium consists of multiple layers.

3. **Functions of Simple Epithelium**:
- Simple epithelium performs several functions including:
- **Diffusion**: Due to its thin structure, it allows substances to diffuse easily.
- **Secretion**: It is involved in the secretion of substances, especially in glands and ducts.
- **Absorption**: It aids in the absorption of nutrients, particularly in the intestines.
- **Movement of substances**: It facilitates the movement of substances, as seen in the fallopian tubes.

4. **Identifying Limitations of Simple Epithelium**:
- While simple epithelium is effective in several functions, it is not effective in providing protection to underlying tissues. This is primarily the role of compound epithelium, which has multiple layers that offer a barrier against physical damage and pathogens.

5. **Conclusion**:
- Based on the functions and limitations discussed, the correct answer to the question "Simple epithelium is not effective in" is **protecting the underlying tissue**.

### Final Answer:
- Simple epithelium is not effective in **protecting the underlying tissue**.

---