When food is put in our mouth, the teeth cut, chew and grind it. The glands A present in mouth secrete a watery liquid B which helps to digest component C present in the food partially. This partially digested food then passes through tube D into an organ E. The inner walls of organ E secrete mucus, hydrochloric acid and digestive juices.
What is D?

Answer

To solve the question, we need to identify what D is in the context of the digestive process described. Here’s a step-by-step breakdown:

1. **Understanding the Process**: When food enters the mouth, teeth cut, chew, and grind it. This mechanical breakdown is the first step in digestion.

**Hint**: Think about the role of teeth in digestion.

2. **Identifying Gland A**: The glands present in the mouth (referred to as gland A) secrete a watery liquid (B). This watery liquid is known as saliva.

**Hint**: Consider what fluid is produced in the mouth to aid digestion.

3. **Component C**: Saliva helps to partially digest component C, which is starch. The enzyme in saliva that helps digest starch is called amylase.

**Hint**: Recall what type of food component saliva acts on.

4. **Movement of Food**: After the food is partially digested in the mouth, it moves through a tube (D) into an organ (E).

**Hint**: Think about the pathway food takes after leaving the mouth.

5. **Identifying Tube D**: The tube that connects the mouth to the stomach is called the esophagus, also known as the food pipe.

**Hint**: What is the name of the tube that transports food from the mouth to the stomach?

6. **Identifying Organ E**: The organ E, where the food enters after passing through tube D, is the stomach. The stomach secretes mucus, hydrochloric acid, and digestive juices.

**Hint**: What organ is responsible for further digesting food after it leaves the esophagus?

**Final Answer**: D is the esophagus.