Chitin exoskelton is found in

Options

A. Cockroach
B. Ascaris
C. Nematoda
D. None

Answer

To determine where chitin exoskeleton is found, we can analyze the options provided:

1. **Understanding Chitin**: Chitin is a complex carbohydrate that forms a significant part of the exoskeleton in certain organisms. It is primarily found in arthropods and some fungi.

2. **Analyzing the Options**:
- **Option A: Cockroach**: Cockroaches are insects, which belong to the phylum Arthropoda. Insects have an exoskeleton made of chitin.
- **Option B: Ascaris**: Ascaris is a type of roundworm (nematode) and does not have an exoskeleton made of chitin. Instead, it has a cuticle.
- **Option C: Nematoda**: This is a phylum that includes roundworms, which also do not possess a chitinous exoskeleton.
- **Option D: None**: This option implies that none of the listed organisms have a chitin exoskeleton, which is incorrect since cockroaches do.

3. **Conclusion**: Based on the analysis, the organism that has a chitin exoskeleton is the cockroach.

**Final Answer**: The chitin exoskeleton is found in **Option A: Cockroach**.

---