Diagnostic character of the phylum Echinodermata is the presence of

Options

A. spiny skin
B. pedicellariae
C. water vascular system
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Echinodermata**: The phylum Echinodermata consists of marine animals that are characterized by specific features. These include sea stars, sea urchins, and sea cucumbers.

2. **Identifying Diagnostic Characters**: The question asks for the diagnostic character of the phylum. Diagnostic characters are traits that are unique to a particular group and help in its identification.

3. **Option A - Spiny Skin**: Echinoderms are known for their spiny skin, which is a prominent feature. This characteristic helps in protection and is a defining trait of the phylum.

4. **Option B - Pedicellariae**: Echinoderms possess pedicellariae, which are small claw-like structures that help in cleaning the surface of the animal and in defense against predators. This feature is also significant in identifying echinoderms.

5. **Option C - Water Vascular System**: Another key characteristic of echinoderms is their water vascular system. This hydraulic system is crucial for locomotion, feeding, and waste transportation. It is a unique feature that distinguishes echinoderms from other phyla.

6. **Conclusion**: Since all the options listed (spiny skin, pedicellariae, and water vascular system) are diagnostic characters of the phylum Echinodermata, the correct answer is option D - all of these.

**Final Answer**: The diagnostic character of the phylum Echinodermata is the presence of spiny skin, pedicellariae, and a water vascular system. Therefore, the correct answer is option D - all of these.

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