Consider the following structures :(i) Notochord(ii) Nerve cord(iii) Pharyngeal gill slits(iv) Tail.How many features are present in larva urochordates?

Options

A. one
B. two
C. three
D. four

Answer

To determine how many features are present in the larva of urochordates, we will analyze each of the structures mentioned in the question: notochord, nerve cord, pharyngeal gill slits, and tail.

### Step-by-Step Solution:

1. **Identify the Structures**: The structures we need to consider are:
- Notochord
- Nerve cord
- Pharyngeal gill slits
- Tail

2. **Understanding Urochordate Larvae**: Urochordates, also known as tunicates, have specific features during their larval stage.

3. **Presence of Notochord**:
- Urochordate larvae possess a notochord, which is a flexible rod-like structure that provides support.

4. **Presence of Nerve Cord**:
- They also have a dorsal nerve cord, which is a characteristic feature of chordates.

5. **Presence of Pharyngeal Gill Slits**:
- Urochordate larvae exhibit pharyngeal gill slits, which are openings that allow water to pass through for feeding and respiration.

6. **Presence of Tail**:
- Urochordate larvae have a tail that extends beyond the body, which aids in locomotion.

7. **Count the Features**:
- All four structures mentioned (notochord, nerve cord, pharyngeal gill slits, and tail) are present in the larva of urochordates.

8. **Conclusion**:
- Therefore, the total number of features present in the larva of urochordates is **4**.

### Final Answer:
The correct answer is **Option D: 4 features**.