Select the option that correctly matches characteristic features with the group of three animals

Options

A. Skeleton of spicules-Sycon, Adamsia, Spongilla
B. Excretion by flame cells- Taenia, Fasciola, Ancyclostoma.
C. Mouth contains radula-Dentalium, Octopus, Ophiura
D. Jointed appendages-Limulus, Apis, Laccifer.

Answer

To solve the question of matching characteristic features with the respective groups of animals, we will analyze each option step by step.

### Step 1: Analyze the First Option
- **Characteristic Feature**: Skeleton of spicules
- **Animals**: Cycone, Fondula, Edentia
- **Analysis**:
- Cycone and Fondula belong to the phylum Porifera, which indeed have skeletons made of spicules.
- Edentia (likely referring to an anemone) belongs to the phylum Cnidaria, which does not have a skeleton made of spicules.
- **Conclusion**: This option is incorrect.

### Step 2: Analyze the Second Option
- **Characteristic Feature**: Excretion by flame cells
- **Animals**: Tinea, Fasciola, Encyclostoma
- **Analysis**:
- Tinea (tapeworm) and Fasciola (liver fluke) belong to the phylum Platyhelminthes, which do excrete using flame cells.
- Encyclostoma (hookworm) belongs to the phylum Nematoda (roundworms), which do not use flame cells for excretion.
- **Conclusion**: This option is also incorrect.

### Step 3: Analyze the Third Option
- **Characteristic Feature**: Mouth contains radula
- **Animals**: Dentalium, Octopus, Ophiura
- **Analysis**:
- Dentalium and Octopus belong to the phylum Mollusca, which have a radula for feeding.
- Ophiura (brittle star) belongs to the phylum Echinodermata, which does not have a radula.
- **Conclusion**: This option is incorrect as well.

### Step 4: Analyze the Fourth Option
- **Characteristic Feature**: Jointed appendages
- **Animals**: Limulus, Apis, Lecifer
- **Analysis**:
- Limulus (horseshoe crab), Apis (honey bee), and Lecifer (a type of insect) all belong to the phylum Arthropoda, which is characterized by jointed appendages.
- **Conclusion**: This option is correct.

### Final Answer
The correct option that matches the characteristic features with the group of animals is the fourth option: **Jointed appendages**.

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