In which one of the following, the genus name, its two characters and its phylum are not correctly matched? `{:("Genus name","Characters","Phylum"),((d)"Periplaneta",(i)"Jointed appendages ","Arthropoda"),(,(ii)"Chitinous exoskeleton",):}`

Options

A. `{:("Genus name","Characters","Phylum"),( "Pila",(i)"Body segmented","Mollusca"),(,(ii)"Mouth with radula",):}`
B. `{:("Genus name","Characters","Phylum"),("Asterias",(i)"Spiny skinned","Echinodermate"),(,(ii)"Water vascular",):}`
C. `{:("Genus name","Characters","Phylum"),("Sycon",(i)"Pore bearing","Porifera"),(,(ii)"Cancal system",):}`
D. `{:("Genus name","Characters","Phylum"),("Periplaneta",(i)"Jointed appendages ","Arthropoda"),(,(ii)"Chitinous exoskeleton",):}`

Explanation

To solve the question of which genus name, its two characters, and its phylum are not correctly matched, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: We have four options to evaluate, each containing a genus name, two characteristics, and a phylum.

2. **Evaluate Each Option**:
- **Option 1: Pila**
- **Genus Name**: Pila
- **Characteristics**:
- Non-segmented body (This is correct for Pila, which is a type of snail)
- Mouth with radula (This is also correct)
- **Phylum**: Mollusca (This is correct for Pila)
- **Conclusion**: All characteristics and phylum are correctly matched.

- **Option 2: Asterias**
- **Genus Name**: Asterias
- **Characteristics**:
- Spiny skin (This is correct; Asterias has a spiny skin due to calcium carbonate structures)
- Water vascular system (This is also correct)
- **Phylum**: Echinodermata (This is correct for Asterias)
- **Conclusion**: All characteristics and phylum are correctly matched.

- **Option 3: Cyclops**
- **Genus Name**: Cyclops
- **Characteristics**:
- Pore-bearing (This is correct; Cyclops are small crustaceans with pores)
- Canal system (This is also correct)
- **Phylum**: Porifera (This is incorrect; Cyclops actually belong to the phylum Arthropoda)
- **Conclusion**: The genus name and phylum are not correctly matched.

- **Option 4: Periplaneta**
- **Genus Name**: Periplaneta
- **Characteristics**:
- Jointed appendages (This is correct; Periplaneta has jointed legs)
- Chitinous exoskeleton (This is also correct; it has a chitinous exoskeleton)
- **Phylum**: Arthropoda (This is correct for Periplaneta)
- **Conclusion**: All characteristics and phylum are correctly matched.

3. **Final Decision**: The only option where the genus name, its characters, and its phylum are not correctly matched is **Option 3: Cyclops**.

### Answer:
The genus name, its two characters, and its phylum that are not correctly matched is **Cyclops** (Pore-bearing, Canal system, Phylum Porifera).

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