Which one of the following nitrogen is not a constituent : -

Options

A. Idioblast
B. Bacteriochlorophyll
C. Invertase
D. Pepsin

Answer

To solve the question "Which one of the following nitrogen is not a constituent?" we will analyze each option provided:

1. **Ideoblast**:
- An ideoblast is a specialized plant cell that differs from neighboring cells and serves various functions such as storage and excretion of materials. Importantly, ideoblasts do not contain nitrogen as a constituent.

2. **Bacteriochlorophyll**:
- Bacteriochlorophyll is a pigment found in certain bacteria that allows them to perform photosynthesis. It is related to chlorophyll and contains nitrogen in its structure.

3. **Invertase**:
- Invertase is an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose. Enzymes are proteins, and proteins are made up of amino acids, which contain nitrogen. Therefore, invertase does contain nitrogen.

4. **Pepsin**:
- Pepsin is a digestive enzyme found in the stomach that breaks down proteins into peptides. Like invertase, pepsin is also a protein and contains nitrogen as part of its amino acid composition.

**Conclusion**:
Based on the analysis, the correct answer is **Ideoblast**, as it is the only option that does not contain nitrogen as a constituent.