Salivary duct of cockroach opens at

Options

A. Hypopharynx
B. Epipharynx
C. Left mandible
D. Right mandible.

Answer

To answer the question about where the salivary duct of a cockroach opens, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: The salivary duct is associated with the salivary glands of the cockroach. These glands produce saliva, which is essential for digestion.

2. **Identify the Mouth Parts**: The mouth of the cockroach consists of several parts:
- Labium (lower lip)
- Labrum (upper lip)
- Maxillae (a pair of jaw-like structures)
- Mandibles (jaws)
- Hypopharynx (a lobe-like structure that acts like a tongue)

3. **Locate the Hypopharynx**: The hypopharynx is centrally located among the other mouth parts. It plays a crucial role in the feeding process.

4. **Trace the Salivary Duct**: The salivary glands are located on either side of the cockroach's head. The ducts from these glands converge into a common duct.

5. **Determine the Opening Point**: The common duct of the salivary glands opens at the base of the hypopharynx. This is where the saliva is released into the mouth for digestion.

6. **Select the Correct Answer**: Based on the above information, the correct answer to the question is that the salivary duct of the cockroach opens at the **hypopharynx**.

### Final Answer:
The salivary duct of the cockroach opens at the **hypopharynx**.

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