Body cavity of arthropods is called

Options

A. Coeleom
B. Hemocoel
C. Pseudocoel
D. Gastrovascular cavity

Answer

To determine the body cavity of arthropods, we need to analyze the options provided:

1. **Understanding the Body Cavity Types**:
- **Coelom**: This is a true body cavity that is completely lined by mesoderm. It is found in more advanced organisms, such as annelids and vertebrates.
- **Haemocoel**: This is an open body cavity found in arthropods where blood (hemolymph) flows freely, bathing the organs directly. It is not completely lined by mesoderm.
- **Pseudocoel**: This is a body cavity that is not completely lined by mesoderm, typically found in organisms like nematodes.
- **Gastrovascular Cavity**: This is a cavity that serves both digestive and circulatory functions, typically found in simpler organisms like cnidarians.

2. **Identifying the Correct Option**:
- Arthropods, which include insects, arachnids, and crustaceans, possess a haemocoel rather than a true coelom. The haemocoel allows for the circulation of hemolymph (the equivalent of blood in these organisms) and is essential for their physiological functions.

3. **Conclusion**:
- Based on the definitions and characteristics of the body cavities, the body cavity of arthropods is called **haemocoel**.

**Final Answer**: The body cavity of arthropods is called **haemocoel** (Option B).

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