External syngamy occurs in case of

Options

A. Reptiles
B. Birds
C. Mammals
D. Bony fishes

Answer

**Step-by-Step Solution:**

1. **Understanding Syngamy**: Syngamy refers to the process of fertilization, which is the fusion of male and female gametes. In biological terms, this means the joining of sperm (male gamete) and egg (female gamete) to form a zygote.

2. **Identifying Types of Fertilization**: Fertilization can occur in two main ways:
- **Internal Fertilization**: This occurs inside the female's body. Examples include reptiles, birds, and mammals.
- **External Fertilization**: This occurs outside the female's body, typically in water. An example of this is seen in many species of fish.

3. **Analyzing the Options**: The question provides four options: reptiles, birds, mammals, and bony fishes.
- Reptiles, birds, and mammals typically exhibit internal fertilization.
- Bony fishes are known for external fertilization, where both eggs and sperm are released into the water during spawning.

4. **Conclusion**: Given that bony fishes reproduce via external fertilization (external syngamy), the correct answer to the question is **bony fishes**.

5. **Final Answer**: External syngamy occurs in case of **bony fishes**.

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