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A free swimming urochordate is...

A free swimming urochordate is

A

Botryllus

B

Ciona

C

Herdmania

D

Salpa

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given options is a free-swimming urochordate, we can follow these steps: ### Step-by-Step Solution: 1. **Understand Urochordates**: Urochordates, also known as tunicates, are a subphylum of the phylum Chordata. They are characterized by having a notochord present only in their larval stage and are typically sessile as adults. 2. **Identify Characteristics**: Urochordates possess a dorsal hollow nerve cord, pharyngeal gill slits, and a postanal tail. However, in adults, the notochord is usually absent. 3. **Analyze the Options**: - **Botrylus**: This is a type of ascidian tunicate that is typically sessile and does not swim freely. - **Siona**: Similar to Botrylus, Siona is also a type of ascidian tunicate and is not free-swimming. - **Herdmania**: Like the previous two, Herdmania is another example of a sessile tunicate. - **Salpa**: Salpa is a free-swimming urochordate that moves by contracting and pumping water through its body. 4. **Conclusion**: Based on the characteristics of the organisms listed, Salpa is the only free-swimming urochordate among the options provided. ### Final Answer: The correct answer is **Salpa**. ---
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