Polylecithal eggs are found in

Options

A. Amphibians
B. Arthropods
C. Eutherians
D. Lung fishes

Answer

**Step-by-Step Solution:**

1. **Understand the Classification of Eggs**: Eggs can be classified based on the amount of yolk they contain. The four main types are:
- **Alecithal**: Eggs with negligible or no yolk (e.g., mammals).
- **Microlecithal**: Eggs with a very small amount of yolk (e.g., tunicates).
- **Mesolecithal**: Eggs with a moderate amount of yolk (e.g., amphibians).
- **Polylecithal**: Eggs with a large quantity of yolk (e.g., insects, birds, reptiles).

2. **Identify Polylecithal Eggs**: Polylecithal eggs are characterized by a high amount of yolk in their cytoplasm. This type of egg is typically found in organisms that require more nutrients for the developing embryo.

3. **List Organisms with Polylecithal Eggs**: The organisms known to have polylecithal eggs include:
- Insects
- Birds
- Reptiles

4. **Analyze the Options Given**: If the question provides options, evaluate each one to determine if they are polylecithal:
- **Amphibians**: Have mesolecithal eggs, not polylecithal.
- **Arthropods**: (e.g., insects) have polylecithal eggs.
- **Uterians**: Typically have alecithal eggs.
- **Lungfishes**: Have mesolecithal eggs.

5. **Conclusion**: Based on the classification and examples, polylecithal eggs are found in arthropods, which include insects, birds, and reptiles.

**Final Answer**: Polylecithal eggs are found in arthropods (insects, birds, reptiles).

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