Find out the wrong statement

Options

A. Amnion is the outer layer containing amniotic fluid that acts as shock absorber to the soft embryo
B. Yolk-sac is a foetal membrane that helps in the nourishment of the embryo in general
C. In mammals allantois is not excretory in function
D. Choroi-allantoic membrane develops villi and contribute much to the development of placenta

Explanation

To find the wrong statement from the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Option 1**: "Amnion is the outer layer containing amniotic fluid that acts as a shock absorbent to the soft embryo."
- The amnion is actually an inner layer, not the outer layer. It does contain amniotic fluid, which acts as a shock absorber for the developing embryo. Thus, this statement is incorrect.

2. **Analyze Option 2**: "Yolk sac is a fetal membrane that helps in the nourishment of the embryo in general."
- The yolk sac does play a role in the nourishment of the embryo, especially in the early stages of development. This statement is correct.

3. **Analyze Option 3**: "In mammals, allantois is not excretory in function."
- In mammals, the allantois does not serve an excretory function; instead, it contributes to the formation of the umbilical cord and the placenta. This statement is correct.

4. **Analyze Option 4**: "Cori allantoic membrane develops and contributes much to the development of the placenta."
- The chorion and allantois do contribute to the formation of the placenta in mammals. This statement is also correct.

### Conclusion:
After analyzing all the options, we can conclude that the wrong statement is **Option 1**.

### Final Answer:
The wrong statement is **Option 1**: "Amnion is the outer layer containing amniotic fluid that acts as a shock absorbent to the soft embryo."

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