The moulting hormone ecdysone belongs to the category of

Options

A. Amines
B. Long chain peptides
C. Steroids
D. Fatty acids.

Answer

**Step-by-Step Solution:**

1. **Understanding Ecdysone**: Ecdysone is known as the moulting hormone. It plays a crucial role in the process of molting, which is the shedding of the exoskeleton in arthropods.

2. **Identifying the Phylum**: Ecdysone is primarily associated with arthropods, particularly insects. The phylum Arthropoda includes various classes such as Insecta, Arachnida, Myriapoda, and Crustacea.

3. **Focusing on Insects**: Among the classes in the phylum Arthropoda, the class Insecta is particularly noted for its use of ecdysone during the life cycle of insects. For example, cockroaches undergo multiple molts (up to 13 times) as they transition from nymphs to adults, facilitated by ecdysone.

4. **Eliminating Other Options**: The question may provide options that include other phyla or classes. For instance, classes like Polychaeta (annelids) and Trematoda (flatworms) do not produce ecdysone, as they do not undergo molting in the same manner as arthropods.

5. **Conclusion**: Based on the above points, we can conclude that the moulting hormone ecdysone belongs to the category of the phylum Arthropoda, specifically within the class Insecta.

**Final Answer**: Ecdysone belongs to the phylum Arthropoda, class Insecta.

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