Correctly matched set of phylum, class and example is

Options

A. Mollusca - Bivalvia - Pinctada
B. Protozoa - Mastigophora - Entamoeba
C. Chordata - Cyclostomata - Phrynosoma
D. Arthropoda - Diplopoda - Scolopendra

Answer

To solve the question "Correctly matched set of phylum, class, and example is," we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the First Option:**
- **Phylum:** Mollusca
- **Class:** Bivalvia
- **Example:** Pinctada
- **Analysis:**
- Mollusca is indeed a phylum that includes organisms with a soft body, often protected by a calcium carbonate shell.
- Bivalvia is a class within Mollusca that includes clams, oysters, and mussels.
- Pinctada is a genus of bivalve mollusks known for producing pearls.
- **Conclusion:** This option is correctly matched.

2. **Identify the Second Option:**
- **Phylum:** Protozoa
- **Class:** Mastigophora
- **Example:** Amoeba
- **Analysis:**
- Protozoa is a phylum of microscopic organisms.
- Mastigophora is a class of protozoans characterized by flagella.
- The example given, Amoeba, is not correct as it belongs to the class Sarcodina, not Mastigophora. The correct example for Mastigophora would be Euglena or Trypanosoma.
- **Conclusion:** This option is incorrectly matched.

3. **Identify the Third Option:**
- **Phylum:** Chordata
- **Class:** Cyclostomata
- **Example:** Pyrenomorpha
- **Analysis:**
- Chordata is a phylum that includes animals with a notochord.
- Cyclostomata is a class within Chordata that includes jawless fish like lampreys.
- Pyrenomorpha is not an example of Cyclostomata; it is a class of fungi. The correct example for Cyclostomata would be Petromyzon (lamprey).
- **Conclusion:** This option is incorrectly matched.

4. **Identify the Fourth Option:**
- **Phylum:** Arthropoda
- **Class:** Diplopoda
- **Example:** Scutigera
- **Analysis:**
- Arthropoda is a phylum that includes invertebrates with an exoskeleton, segmented bodies, and jointed appendages.
- Diplopoda is a class within Arthropoda that includes millipedes.
- Scutigera, however, refers to a genus of centipedes, which belong to a different class (Chilopoda).
- **Conclusion:** This option is incorrectly matched.

### Final Answer:
The correctly matched set of phylum, class, and example is:
- **Phylum:** Mollusca
- **Class:** Bivalvia
- **Example:** Pinctada