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 C?

Answer

To solve the question, we will break down the information provided step by step.

### Step 1: Identify the glands in the mouth
When food is placed in our mouth, the teeth cut, chew, and grind it. The glands present in the mouth are known as salivary glands.

**Hint:** Think about what glands are located in the mouth and what they secrete.

### Step 2: Determine the watery liquid secreted by the glands
The salivary glands secrete a watery liquid known as saliva. Saliva plays a crucial role in the digestion process.

**Hint:** Recall the name of the liquid that helps in the digestion of food in the mouth.

### Step 3: Identify the component of food that is digested
The watery liquid (saliva) contains an enzyme called amylase, which helps to digest carbohydrates. The main component of food that is partially digested by amylase is starch.

**Hint:** Consider what type of food component is primarily broken down by enzymes in saliva.

### Step 4: Understand the passage of partially digested food
After the food is chewed and mixed with saliva, it forms a soft mass that passes through a tube known as the esophagus (or food pipe) into the stomach.

**Hint:** Think about the pathway food takes after being chewed in the mouth.

### Step 5: Identify the organ where the food goes next
The organ that receives the partially digested food from the esophagus is the stomach. The stomach's inner walls secrete mucus, hydrochloric acid, and digestive juices to further aid in digestion.

**Hint:** Recall the organ that follows the esophagus in the digestive system.

### Conclusion
Based on the above steps, the component C that is partially digested by the saliva in the mouth is **starch**.

**Final Answer:** C is starch.