The largest part of the alimentary canal of cockroach is

Options

A. crop
B. ileum
C. rectum
D. mesenteron

Answer

To determine the largest part of the alimentary canal of a cockroach, we will analyze the different sections of the alimentary canal and their characteristics.

### Step-by-Step Solution:

1. **Understand the Structure of the Alimentary Canal**: The alimentary canal of a cockroach is divided into several parts: the foregut, midgut, and hindgut. Each of these sections has specific functions and structures.

2. **Identify the Parts**: The main parts of the alimentary canal include:
- **Crop**: A sac-like structure that stores food.
- **Gizzard**: A muscular structure that grinds food.
- **Midgut (Mesenteron)**: Where digestion and absorption occur.
- **Ileum**: Part of the hindgut.
- **Rectum**: The terminal part of the hindgut that stores feces.

3. **Compare Sizes**:
- The **crop** is a large, sac-like structure that can hold a significant amount of food.
- The **ileum** and **rectum** are smaller in size compared to the crop.
- The **mesenteron** is also not as large as the crop.

4. **Conclusion**: Among the options provided (crop, ileum, rectum, mesenteron), the crop is identified as the largest part of the alimentary canal of a cockroach.

5. **Final Answer**: The largest part of the alimentary canal of a cockroach is the **crop**.