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Notochord is persistent throughout life ...

Notochord is persistent throughout life in

A

lancelets

B

fishes

C

tunicates

D

frogs

Text Solution

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The correct Answer is:
To determine in which organisms the notochord is persistent throughout life, we can follow these steps: ### Step 1: Understand the Notochord The notochord is a flexible rod-like structure that provides support in the embryonic stage of all chordates. In many vertebrates, it is replaced by the vertebral column (spine) during development. ### Step 2: Identify the Phyla We need to identify which phyla have a persistent notochord throughout life. The two main phyla where the notochord persists are: 1. **Cephalochordata** (lancelets) 2. **Urochordata** (tunicates) ### Step 3: Analyze the Options Now, let's analyze the options given in the question: - **Lancelet (Cephalochordata)**: The notochord is present throughout life. - **Frogs (Vertebrata)**: They have a vertebral column, not a persistent notochord. - **Tunicates (Urochordata)**: While they have a notochord in their larval stage, it is not persistent throughout life. - **Landslide fishes (also Vertebrata)**: They have a vertebral column, not a persistent notochord. ### Step 4: Conclusion Based on the analysis, the only organism where the notochord is persistent throughout life is the **lancelet** from the phylum **Cephalochordata**. ### Final Answer The correct answer is **Lancelet (Cephalochordata)**. ---
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