Cnidoblasts are found in

Options

A. freshwater polyp and water flea
B. sea star and sea cucumber
C. sea pen and sea fan
D. sea anemone and sea walnut

Answer

**Step-by-Step Solution:**

1. **Understanding Cnidoblasts**: Cnidoblasts, also known as cnidocytes, are specialized cells that contain a structure called a nematocyst. These cells are primarily responsible for the stinging mechanism in certain animals.

2. **Identifying the Organisms**: Cnidoblasts are predominantly found in members of the phylum Cnidaria. This includes organisms such as jellyfish, corals, sea anemones, and hydras.

3. **Function of Cnidoblasts**: The primary function of cnidoblasts is to capture prey and provide defense. The nematocysts within these cells can inject toxins into other organisms, which can immobilize or deter predators.

4. **Examples of Cnidarians**: Common examples of organisms that possess cnidoblasts include:
- Jellyfish (e.g., Aurelia)
- Sea anemones (e.g., Actinia)
- Corals (e.g., Acropora)

5. **Conclusion**: Therefore, cnidoblasts are found in organisms belonging to the phylum Cnidaria, such as sea pens and sea fans.

**Final Answer**: Cnidoblasts are found in organisms of the phylum Cnidaria, including sea pens and sea fans.

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