Identify the digestive glands which are present within the alimentary canal?

Options

A. Salivary glands
B. Pancreas
C. Liver
D. All of these

Explanation

To identify the digestive glands present within the alimentary canal, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Alimentary Canal**: The alimentary canal is a continuous tube that runs from the mouth to the anus. It is responsible for the digestion and absorption of food.

2. **Identify the Digestive Glands**: Digestive glands are organs that secrete substances that aid in the digestion of food. The main digestive glands include:
- Salivary glands
- Pancreas
- Liver

3. **Locate the Digestive Glands in the Alimentary Canal**:
- **Salivary Glands**: These are located in the mouth and secrete saliva, which begins the digestion of carbohydrates.
- **Pancreas**: Although it plays a crucial role in digestion by secreting digestive enzymes, it is not located within the alimentary canal; it is an accessory organ.
- **Liver**: Similar to the pancreas, the liver produces bile, which is important for fat digestion, but it is also not located within the alimentary canal.

4. **Conclusion**: Among the options provided, the only digestive gland that is present within the alimentary canal is the **salivary gland**.

### Final Answer:
The digestive gland present within the alimentary canal is the **salivary gland**.

---