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Stomochord is a hollow outgrowth which a...

Stomochord is a hollow outgrowth which arises from the roof of the buccal cavity. It is present in

A

Chordata

B

Cephalochordata

C

Urochordata

D

Hemichordata.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Stomochord**: The stomochord is described as a hollow outgrowth that arises from the roof of the buccal cavity. It is important to identify where this structure is found in the animal kingdom. 2. **Analyzing the Options**: The question provides four options: - A. Chordata - B. Cephalochordata - C. Eurochordata - D. Hemichordata 3. **Identifying the Correct Group**: - **Chordata**: This phylum includes animals with a notochord, which is different from a stomochord. - **Cephalochordata**: This subphylum includes lancelets, which do not possess a stomochord. - **Eurochordata**: This subphylum includes tunicates, which also do not have a stomochord. - **Hemichordata**: This phylum includes acorn worms, which are known to possess a stomochord. 4. **Conclusion**: Based on the analysis, the stomochord is specifically found in Hemichordata. Therefore, the correct answer to the question is **D. Hemichordata**. ---
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