Exoskeleton of arthropods contains a complex hetero polysaccharide called

Options

A. Pectin
B. Chitin
C. Cellulose
D. Starch

Answer

To answer the question regarding the complex heteropolysaccharide found in the exoskeleton of arthropods, we can break down the solution into several steps:

### Step-by-Step Solution:

1. **Understanding the Exoskeleton of Arthropods**:
- The exoskeleton is a hard outer structure that provides support and protection to arthropods, such as insects, crustaceans, and arachnids.

2. **Identifying the Composition**:
- The primary component of the exoskeleton is a polysaccharide. Polysaccharides are long chains of sugar molecules that can be complex in structure.

3. **Evaluating the Options**:
- The options provided are:
- a) Pectin
- b) Chitin
- c) Cellulose
- d) Starch

4. **Analyzing Each Option**:
- **Pectin**: This is a polysaccharide found in plant cell walls, not in arthropods. Thus, it is incorrect.
- **Chitin**: This is a complex heteropolysaccharide and is indeed the main component of the exoskeleton of arthropods. It is a polymer made from N-acetylglucosamine (NAG) units. Therefore, this is the correct answer.
- **Cellulose**: This is a polysaccharide found in plant cell walls and is not present in arthropods. Thus, it is incorrect.
- **Starch**: This is a storage polysaccharide in plants and is not found in the exoskeleton of arthropods. Thus, it is incorrect.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Chitin** (option b).

### Final Answer:
The exoskeleton of arthropods contains a complex heteropolysaccharide called **Chitin**.