One of the following is not a constituent of saliva `:`

Options

A. Biocarbonate
B. Lysozyme
C. Glucose
D. Immunoglobulin

Answer

To determine which of the following is not a constituent of saliva, we will analyze each option provided:

1. **Understand the Composition of Saliva**:
- Saliva is primarily composed of about 99.5% water.
- The remaining 0.5% consists of various components including electrolytes, enzymes, mucus, glycoproteins, and antibacterial compounds.

2. **Evaluate Each Option**:
- **Bicarbonate**: This is an electrolyte found in saliva that helps maintain pH balance. Thus, it is a constituent of saliva.
- **Lysozyme**: This is an enzyme present in saliva that has antibacterial properties. Therefore, it is also a constituent of saliva.
- **Glucose**: This is a simple sugar that is not typically found in saliva. It is not a natural constituent of saliva.
- **Immunoglobulin**: These are antibodies present in saliva that play a role in immune response. Hence, they are also a constituent of saliva.

3. **Conclusion**:
- After evaluating all the options, we find that **glucose** is not a constituent of saliva. Therefore, the correct answer is **glucose**.