Non chitinous layer of cuticle of the body wall 

Options

A. Epicuticle
B. Exocuticle
C. Endocuticle
D. 1 & 2

Answer

To solve the question regarding the non-chitinous layer of the cuticle of the body wall, we will analyze the options provided:

1. **Understanding the Cuticle**: The cuticle is the outermost layer of the body wall in certain organisms, particularly arthropods. It serves as a protective barrier and is involved in various functions such as preventing water loss and providing structural support.

2. **Identifying the Layers**: The cuticle is typically composed of several layers:
- **Epicuticle**: This is the outermost layer and is non-chitinous.
- **Exocuticle**: This layer is beneath the epicuticle and is chitinous.
- **Endocuticle**: This is the innermost layer of the cuticle and is also chitinous.

3. **Analyzing the Options**:
- **Epicutical**: This is the correct answer as it is the non-chitinous layer of the cuticle.
- **Exocutical**: This layer contains chitin, thus it is not the correct answer.
- **Endocutical**: This layer also contains chitin, making it incorrect as well.
- **1 and 2**: This option suggests both epicutical and exocutical, but since exocutical is chitinous, this option is incorrect.

4. **Conclusion**: The only non-chitinous layer of the cuticle of the body wall is the **epicutical**.

**Final Answer**: The non-chitinous layer of the cuticle of the body wall is **epicutical**.

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