The larval form of coelenterates is called by which of the following names?

Options

A. Medusa
B. Polyp
C. Zooid
D. Planula

Answer

**Step-by-Step Solution:**

1. **Understanding Coelenterates**: Coelenterates, also known as Cnidarians, are a group of animals that include jellyfish, corals, and sea anemones. They have distinct life stages, including larval forms.

2. **Identifying the Larval Form**: The question asks for the name of the larval form of coelenterates. In the life cycle of coelenterates, the larval stage is crucial for development.

3. **Recognizing the Planula Larvae**: The larval form of coelenterates is specifically known as "Planula larvae." These larvae are small and motile, meaning they can move freely in the water.

4. **Differentiating Other Stages**: It's important to differentiate Planula from other stages:
- **Medusa**: This is a motile stage of Cnidarians, but it is not the larval form.
- **Polyp**: This is a non-motile stage where both asexual and sexual reproduction can occur, but it is also not the larval form.
- **Zooid**: This term refers to a single animal in a colony, not specifically a larval form.

5. **Conclusion**: Based on the information, the correct answer to the question is that the larval form of coelenterates is called "Planula larvae."

**Final Answer**: The larval form of coelenterates is called Planula larvae.

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