Pick out the odd character with respet to echinoderms

Options

A. Water vascular system
B. Pedicellariae
C. Autotomy
D. Paired jointed appendages

Answer

To solve the question of identifying the odd character with respect to echinoderms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Echinoderms**: Echinoderms are a group of marine animals that include starfish, sea urchins, and sea cucumbers. They are characterized by their radial symmetry, a water vascular system, and a calcareous endoskeleton.

2. **Analyze the Options**: We need to evaluate each option provided to determine if it is a characteristic of echinoderms.

- **Option 1: Water Vascular System**
- This is a defining feature of echinoderms. It is a system of canals and tube feet that helps in locomotion, feeding, and gas exchange.
- **Conclusion**: This option is NOT the odd one out.

- **Option 2: Pedicellariae**
- Pedicellariae are small pincer-like structures found on the surface of many echinoderms. They help in keeping the surface clean and can also serve a defensive function.
- **Conclusion**: This option is NOT the odd one out.

- **Option 3: Autotomy**
- Autotomy refers to the ability of an organism to shed a body part, usually as a defense mechanism. Many echinoderms can regenerate lost limbs, which is a characteristic feature.
- **Conclusion**: This option is NOT the odd one out.

- **Option 4: Paired Jointed Appendages**
- This characteristic is typically associated with arthropods, such as insects and crustaceans, rather than echinoderms. Echinoderms do not have paired jointed appendages; instead, they have tube feet and other structures that are not jointed.
- **Conclusion**: This option is the odd one out.

3. **Final Answer**: The odd character with respect to echinoderms is **Paired Jointed Appendages**.