Which one of the following is a wrong statement?

Options

A. Protein digestion starts in stomach.
B. In mouth, food undergoes both mechanical and chemical digestion.
C. Chemical digestion of food occurs in oesophagus.
D. Rectum stores waste material temporarily.

Explanation

To determine which statement is wrong, let's analyze each statement related to the digestion process step by step.

1. **Statement 1: Protein digestion starts in the stomach.**
- This statement is **correct**. Protein digestion begins in the stomach where proteolytic enzymes break down proteins into amino acids.

2. **Statement 2: In the mouth, food undergoes both mechanical and chemical digestion.**
- This statement is also **correct**. In the mouth, food is mechanically broken down by chewing (mechanical digestion) and mixed with saliva which contains enzymes that begin the chemical digestion process.

3. **Statement 3: Chemical digestion of food occurs in the esophagus.**
- This statement is **wrong**. The esophagus is primarily responsible for transporting food to the stomach and does not play a significant role in chemical digestion. The main site for chemical digestion is the stomach.

4. **Statement 4: Rectum stores waste material temporarily.**
- This statement is **correct**. The rectum is part of the large intestine and serves to store waste material before it is expelled from the body.

**Conclusion:**
The wrong statement among the options provided is: "Chemical digestion of food occurs in esophagus."

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