Arms, spines and pedicellaria are absent in

Options

A. Sea urchin
B. Sea star
C. Sea lily
D. sea cucumber

Answer

To answer the question "Arms, spines and pedicellaria are absent in," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Features**: Understand that arms, spines, and pedicellaria are distinct features found in organisms belonging to the phylum Echinodermata.

2. **Understand the Functions**:
- **Arms**: These help in transferring food from the surface to the mouth.
- **Spines**: These serve as a defense mechanism and assist in locomotion.
- **Pedicellaria**: These structures help in cleaning the body and protecting it from predators.

3. **Examine the Classes of Echinodermata**:
- **Echinoidea** (e.g., Sea Urchins): Have arms, spines, and pedicellaria.
- **Asteroidea** (e.g., Sea Stars): Have arms, spines, and pedicellaria.
- **Crinoidea** (e.g., Sea Lilies): Have arms, spines, and pedicellaria.

4. **Identify the Exception**:
- **Holothuroidea** (e.g., Sea Cucumbers): In this class, arms, spines, and pedicellaria are absent. Although they may have projections that resemble arms, they do not function as true arms.

5. **Conclusion**: Based on the analysis, the organism in which arms, spines, and pedicellaria are absent is the Sea Cucumber, which belongs to the class Holothuroidea.

### Final Answer:
**Arms, spines, and pedicellaria are absent in Sea Cucumber (Holothuroidea).**

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