In chordates, basically the pharynx is

Options

A. Perforated
B. Non-perforated
C. Present in the gut of the larva
D. A source of thyroxin which controls meta morphosis

Answer

To answer the question "In chordates, basically the pharynx is:", we will analyze the options provided and determine the correct answer based on the characteristics of the pharynx in chordates.

### Step-by-Step Solution:

1. **Understanding the Pharynx**:
- The pharynx is a part of the throat located behind the mouth and nasal cavity in chordates. It plays a crucial role in both the respiratory and digestive systems.

2. **Evaluating the Options**:
- **Option A: Perforated** - The pharynx in many chordates, especially in larval forms like those of amphibians, is perforated. These perforations allow water to flow through, facilitating respiration.
- **Option B: Non-perforated** - This option is incorrect as the pharynx in many chordates is indeed perforated.
- **Option C: Present in gut of larvae** - While the pharynx is involved in the digestive system, it is not accurate to say it is simply "present in the gut." It is more accurately described as part of the throat.
- **Option D: A source of thyroxine which controls metamorphosis** - This is incorrect because thyroxine is produced by the thyroid gland, not the pharynx.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option A: Perforated**. The pharynx in chordates is characterized by its perforated structure, especially in larval forms, which aids in respiration.

### Final Answer:
**The pharynx in chordates is perforated (Option A).**