Alimentary canal is derived from

Options

A. Endoderm
B. Ectoderm
C. Mesoderm
D. Ectoderm and endoderm

Answer

**Step-by-Step Solution:**

1. **Understanding the Alimentary Canal:**
- The alimentary canal is the tubular structure that begins at the mouth and ends at the anus. It is a crucial part of the digestive system.

2. **Identifying Germ Layers:**
- During embryonic development, three primary germ layers are formed: ectoderm, mesoderm, and endoderm.
- **Ectoderm:** The outer layer, responsible for forming the skin and nervous system.
- **Mesoderm:** The middle layer, which gives rise to the skeletal system, muscular system, dermis of the skin, and circulatory system.
- **Endoderm:** The inner layer, which is essential for forming the epithelial lining of the gastrointestinal tract.

3. **Relating Germ Layers to the Alimentary Canal:**
- The epithelial lining of the gastrointestinal tract, which includes the alimentary canal, is derived from the endoderm. Additionally, associated glands such as the liver and pancreas also originate from the endoderm.

4. **Conclusion:**
- Based on the information regarding the germ layers and their contributions to various body systems, we conclude that the alimentary canal is derived from the endoderm.

5. **Final Answer:**
- The correct answer to the question is option 1: **Endoderm**.

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