Identify the incorrect statement(s) from the following
i. Enzymes of panereatic juice not only digest the polypeptides but also polynucleotides
ii. Bile juice has not only digestive enzymes but also bile salts
ii Saliva is not only a digestive juice but also acts as first line of defence
iv. The cells of pylorie glands not only seerete mucous but also gastrin hormone

Options

A. I and ii
B. ii only
C. ii and iv
D. iv only

Answer

To solve the question of identifying the incorrect statements, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement i**: "Enzymes of pancreatic juice not only digest the polypeptides but also polynucleotides."
- **Analysis**: This statement is correct. Pancreatic enzymes, such as trypsin and chymotrypsin, digest proteins (polypeptides), and nucleases in pancreatic juice can digest nucleic acids (polynucleotides).

2. **Statement ii**: "Bile juice has not only digestive enzymes but also bile salts."
- **Analysis**: This statement is incorrect. Bile juice does not contain digestive enzymes; it primarily contains bile salts, which help in the emulsification of fats. Therefore, this statement is false.

3. **Statement iii**: "Saliva is not only a digestive juice but also acts as a first line of defence."
- **Analysis**: This statement is correct. Saliva contains enzymes like amylase for digestion and also has antimicrobial properties, contributing to the immune defense of the oral cavity.

4. **Statement iv**: "The cells of pyloric glands not only secrete mucus but also gastrin hormone."
- **Analysis**: This statement is correct. The pyloric glands in the stomach secrete mucus and also produce the hormone gastrin, which stimulates gastric acid secretion.

### Conclusion:
- The only incorrect statement is **Statement ii**.

Thus, the answer to the question is that the incorrect statement is **Statement ii only**.