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

Options

A. Mollusca-Normally oviparous and development through a trochophore or veliger larva
B. Arthropoda-body divided into head, thorax and abdomen and respiration by tracheae
C. Chordata- Notochord at some stage and separate anal and urinary opening to the outside
D. Echinodermata-Pentamerous radial symmetry and mostly internal fertilization

Answer

To solve the question of which phyla is correctly matched with its two general characteristics, we will analyze each option provided:

### Step 1: Analyze Option A - Mollusca
- **Characteristics**: Oviparous (egg-laying) and indirect development (larval stage).
- **Evaluation**: This statement is correct. Molluscs typically lay eggs, and their development often involves larval stages such as trochophore or veliger larvae.

### Step 2: Analyze Option B - Arthropoda
- **Characteristics**: Largest phylum of the animal kingdom with jointed appendages and respiration by trachea.
- **Evaluation**: The first part is correct; Arthropoda is indeed the largest phylum and has jointed appendages. However, the respiration is not through trachea but rather through a tracheal system, making this statement incorrect.

### Step 3: Analyze Option C - Caudata
- **Characteristics**: Presence of notochord at some stage and separate anal and urinary openings.
- **Evaluation**: The presence of a notochord is true, but the statement about having separate anal and urinary openings is not always applicable to all caudates, making this statement incorrect.

### Step 4: Analyze Option D - Echinodermata
- **Characteristics**: Pentamerous radial symmetry and mostly internal fertilization.
- **Evaluation**: While pentamerous radial symmetry is true, echinoderms primarily exhibit external fertilization, making this statement incorrect.

### Conclusion
After evaluating all options, the only phylum that is correctly matched with its two general characteristics is **Option A - Mollusca**.

### Final Answer
**The correct answer is Option A - Mollusca.**

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