Tick mark the false statement.

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

**Step-by-Step Solution:**

1. **Identify the Statements:**
- The question requires us to identify which of the provided statements is false regarding digestion and the role of salivary amylase.

2. **Analyze Each Statement:**
- **Statement 1:** "About 60% of starch is hydrolyzed by the buccal cavity by the enzyme salivary amylase."
- This statement is false. The correct percentage is approximately 30% of starch that is hydrolyzed in the buccal cavity.

- **Statement 2:** "Salivary amylase acts on starch and is converted into maltose."
- This statement is true. Salivary amylase catalyzes the breakdown of starch into maltose.

- **Statement 3:** "Salivary amylase acts at optimum pH 6.8."
- This statement is true. Salivary amylase has an optimum pH around 6.8, which is suitable for its activity in the mouth.

- **Statement 4:** "Stomach stores the food for 4 to 5 hours."
- This statement is true. The stomach can store food for approximately 4 to 5 hours before passing it to the small intestine.

3. **Conclusion:**
- The false statement is the first one, which incorrectly states that 60% of starch is hydrolyzed by salivary amylase in the buccal cavity.

**Final Answer:**
- The false statement is: "About 60% of starch is hydrolyzed by the buccal cavity by the enzyme salivary amylase."

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