Which one of the following phyla is correctly matched with its general characteristics ?

Options

A. Porifera - Cellular level of organisation and external fertilisation
B. Coelenterata - Diploblastic and mostly Asymmetric
C. Aschelminthes - Pseudocoelomates and dioecious
D. Hemichordata - Coelomates and closed Circulatory system

Answer

To solve the question "Which one of the following phyla is correctly matched with its general characteristics?", we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the First Option: Porphyra**
- Characteristics: Cellular level of organization and external fertilization.
- Analysis: This option is incorrect because most Porphyra species exhibit internal fertilization, not external.

2. **Identify the Second Option: Cnidaria (referred to as Sealant Rater in the transcript)**
- Characteristics: Diploblastic and mostly asymmetric.
- Analysis: This option is also incorrect. Cnidarians are indeed diploblastic, but they exhibit radial symmetry, not asymmetry.

3. **Identify the Third Option: Aschelminthes**
- Characteristics: Pseudocoelomates and dioecious.
- Analysis: This option is correct. Aschelminthes (or pseudocoelomates) do possess a pseudocoelom and are typically dioecious (having distinct male and female organisms).

4. **Identify the Fourth Option: Hemichordata**
- Characteristics: Coelomates and closed circulatory system.
- Analysis: This option is incorrect because Hemichordates have an enterocoelous coelom and possess an open circulatory system.

### Conclusion:
The correct answer is **Aschelminthes**, as it is the only phylum that is correctly matched with its general characteristics.