Identify the mismatched pair.

Options

A. Annelida `to` Animals with pseudocoelom
B. Arthropoda `to` Jointed leg organisms
C. Porifera `to` Organisms with holes on body
D. Echinodermata `to` Spiny skinned organisms

Answer

To identify the mismatched pair from the given options, we will analyze each option step by step.

### Step 1: Analyze the first option - Annelida
- **Claim**: Annelida is matched with pseudocoelom.
- **Evaluation**: Annelids are actually coelomates, meaning they have a true coelom (also referred to as a schizo-coelom). The term "pseudocoelom" refers to a different type of body cavity found in organisms like nematodes.
- **Conclusion**: This pair is mismatched.

### Step 2: Analyze the second option - Arthropoda
- **Claim**: Arthropoda is matched with jointed leg organisms.
- **Evaluation**: Arthropods are indeed characterized by having jointed legs and an exoskeleton. This is a correct match.
- **Conclusion**: This pair is correctly matched.

### Step 3: Analyze the third option - Porifera
- **Claim**: Porifera is matched with organisms that have holes all over their body.
- **Evaluation**: Porifera, commonly known as sponges, do have numerous pores (or holes) in their bodies for water flow. This is a correct match.
- **Conclusion**: This pair is correctly matched.

### Step 4: Analyze the fourth option - Echinodermata
- **Claim**: Echinodermata is matched with spiny-skinned organisms.
- **Evaluation**: Echinoderms, such as starfish and sea urchins, are indeed known for their spiny skin. This is a correct match.
- **Conclusion**: This pair is correctly matched.

### Final Conclusion
After analyzing all the options, the mismatched pair is:
- **Annelida with pseudocoelom** (This is incorrect; Annelida has a true coelom).