Which of the following options is incorrect regarding digestion of fats?

Options

A. Lipase is present in pancreatic juice but absent in intestinal juice.
B. Emulsifications of fat increases the action of lipase on fat.
C. Most of the fat is digested by pancreatic lipase in the small intestine.
D. Bile salts convert fat droplets into smaller ones by reducing their surface tension.

Answer

To determine which option is incorrect regarding the digestion of fats, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Lipase**:
- Lipase is an enzyme that plays a crucial role in the digestion of fats. It breaks down fats into fatty acids and glycerol.
- **Hint**: Remember that lipase is essential for fat digestion.

2. **Evaluating Option 1**:
- The statement claims that lipase is present in pancreatic juice but absent in intestinal juice.
- This is incorrect because lipase is indeed present in both pancreatic juice and intestinal juice.
- **Hint**: Check the sources of lipase in the digestive system.

3. **Evaluating Option 2**:
- This option states that emulsification of fat increases the action of lipase on fat.
- This statement is correct. Emulsification, primarily by bile salts, increases the surface area of fats, making them more accessible to lipase.
- **Hint**: Consider how emulsification affects enzyme activity.

4. **Evaluating Option 3**:
- This option states that most of the fat is digested by pancreatic lipase in the small intestine.
- This statement is correct as pancreatic lipase is the primary enzyme responsible for fat digestion in the small intestine.
- **Hint**: Recall where the majority of fat digestion occurs.

5. **Evaluating Option 4**:
- This option claims that bile salts convert fat droplets into smaller ones by reducing their surface tension.
- This statement is also correct. Bile salts emulsify fats, making them easier for lipase to act on.
- **Hint**: Understand the role of bile salts in fat digestion.

### Conclusion:
After evaluating all the options, the incorrect statement is **Option 1**, which claims that lipase is absent in intestinal juice.

### Summary of Incorrect Option:
- **Incorrect Statement**: Lipase is present in pancreatic juice but absent in intestinal juice.