Which of the following animals, is /are ovoviviparous

Options

A. Hen
B. Platypus
C. (1) and (2)
D. Rattle snake

Answer

To determine which animals are ovoviviparous, we need to understand the definitions of the three reproductive strategies: viviparous, oviparous, and ovoviviparous.

### Step-by-Step Solution:

1. **Define Reproductive Strategies**:
- **Viviparous**: Animals that give birth to live young. In these species, the embryo develops inside the mother and is nourished through a placenta (e.g., humans).
- **Oviparous**: Animals that lay eggs, which develop and hatch outside the mother's body (e.g., birds, reptiles).
- **Ovoviviparous**: Animals that produce eggs that hatch inside the mother's body, leading to the birth of live young. The embryos are nourished by the yolk of the egg rather than directly from the mother (e.g., some species of sharks and snakes).

2. **Analyze the Given Options**:
- **Hen**: Hens are birds that lay eggs, so they are oviparous.
- **Platypus**: The platypus is a unique egg-laying mammal, which means it is also oviparous.
- **Rattlesnake**: Rattlesnakes are known to be ovoviviparous, as they give birth to live young that develop from eggs retained within the mother's body.

3. **Conclusion**:
- Based on the definitions and the analysis of the options, the only animal listed that is ovoviviparous is the rattlesnake.

### Final Answer:
The animal that is ovoviviparous from the given options is the **rattlesnake**.

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