Human placenta is chorionic and discoidal.

Answer

### Step-by-Step Solution:

1. **Understanding the Types of Placenta**:
- The question states that the human placenta is chorionic and discoidal. It is essential to clarify what these terms mean in the context of placental types.
- **Chorionic** refers to the chorion, which is the outermost membrane surrounding the embryo. It plays a crucial role in forming the placenta.

2. **Defining Chorionic Placenta**:
- The chorion is known as the outermost extra-embryonic layer. It provides protection to the embryo from external shocks and is involved in nutrient and gas exchange.
- In reptiles, the chorionic placenta is more prominent, where the chorion plays a significant role in the formation of the placenta.

3. **Defining Discoidal Placenta**:
- A discoidal placenta is characterized by a smooth chorion that does not contribute to placenta formation. Instead, other extra-embryonic layers like the amnion, allantois, and yolk sac participate in the formation of the placenta.
- This type of placenta is typically found in species like rabbits.

4. **Human Placenta Characteristics**:
- The statement in the question is incorrect because the human placenta is not classified as chorionic and discoidal.
- Instead, the human placenta is classified as **hemochorial**. This means that the chorion is in direct contact with maternal blood, allowing for efficient nutrient and gas exchange.

5. **Conclusion**:
- Therefore, the correct classification of the human placenta is hemochorial, not chorionic and discoidal. The presence of chorionic villi facilitates the direct exchange of maternal blood with the fetal blood.