The exoskeleton of cockroach is made up of

Options

A. chitin
B. cellulase
C. glycogen
D. cuticle

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question is about the exoskeleton of a cockroach, which is an insect. Insects belong to the phylum Arthropoda.

2. **Understand the Composition of Exoskeleton**: Insects, including cockroaches, have an exoskeleton that is a defining characteristic of the phylum Arthropoda.

3. **Determine the Material of Exoskeleton**: The exoskeleton of cockroaches is primarily made up of a substance called chitin. Chitin is a long-chain polymer that is a derivative of glucose and is a key component in the structure of the exoskeleton.

4. **Evaluate Other Options**:
- **Option B: Cellulase**: This is an enzyme that breaks down cellulose, not a structural component of an exoskeleton.
- **Option C: Glycogen**: This is a storage form of glucose and is not related to the structure of an exoskeleton.
- **Option D: Cuticle**: While a cuticle can refer to a protective layer, it is not the primary component of the cockroach's exoskeleton.

5. **Conclusion**: Based on the analysis, the correct answer is that the exoskeleton of the cockroach is made up of **chitin**.

**Final Answer**: The exoskeleton of cockroach is made up of **chitin** (Option A).

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