Body cavity of annelids/Nereis is

Options

A. schizocoel
B. enterocoel
C. pseudocoel
D. none of these

Answer

**Step-by-Step Text Solution:**

1. **Understanding Body Cavity in Annelids:**
- Annelids, which include organisms like Nereis, possess a body cavity that plays a crucial role in their physiology.

2. **Definition of Coelom:**
- The body cavity in annelids is referred to as a coelom. This is a fluid-filled space located between the outer body wall and the digestive tract (gut).

3. **Type of Coelom in Annelids:**
- Annelids are classified as coelomates because they have a well-developed coelom. This means their body cavity is fully lined with mesodermal tissue.

4. **Formation of the Coelom:**
- The coelom in annelids is formed by a process known as schizocoely, which involves the splitting of mesodermal embryonic tissue during development.

5. **Conclusion:**
- Therefore, the body cavity of annelids, including Nereis, is classified as a "secoel" (or true coelom).

6. **Final Answer:**
- The correct answer to the question is Option A: Sesocele.

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