Choose the false statement from the following.

Options

A. About 60 % starch is hydrolysed in buccal cavity by the enzyme salivary amylase
B. Salivary amylase acts on starch and is converted into maltose
C. Salivary amylase acts at optimum pH 6.8
D. Stomach stores the food for 4-5 hours

Answer

To solve the question of identifying the false statement, we will analyze each of the provided options step by step.

### Step 1: Analyze Option 1
- **Statement**: About 60% starch is hydrolyzed in the buccal cavity by the enzyme salivary amylase.
- **Analysis**: This statement is incorrect. In reality, only about 30% of starch is hydrolyzed in the buccal cavity, not 60%. Therefore, this statement is false.

### Step 2: Analyze Option 2
- **Statement**: Salivary amylase acts on starch and is converted into maltose.
- **Analysis**: This statement is correct. Salivary amylase breaks down starch into maltose, which is a disaccharide.

### Step 3: Analyze Option 3
- **Statement**: Salivary amylase acts at optimum pH 6.8.
- **Analysis**: This statement is also correct. The optimum pH for salivary amylase activity is indeed around 6.8.

### Step 4: Analyze Option 4
- **Statement**: Stomach stores the food for 4 to 5 hours.
- **Analysis**: This statement is correct as well. The stomach can store food for approximately 4 to 5 hours before it is released into the duodenum.

### Conclusion
After analyzing all the options, we find that the false statement is **Option 1**: "About 60% starch is hydrolyzed in the buccal cavity by the enzyme salivary amylase."

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