A : placenta is connected to the embryo through an umbilical cord which helps in the transport of substance to and from the embryo
R : Palcenta acts as an endocrine tissue

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)
C. If Assertion is true statement but Reason is false then mark (3)
D. If both Assertion and Reason are false statement then Mark (4)

Answer

To analyze the assertion and reason provided in the question, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that the placenta is connected to the embryo through an umbilical cord, which facilitates the transport of substances to and from the embryo.
- This is true because the umbilical cord serves as a vital connection between the mother and the fetus, allowing for the exchange of nutrients, gases, and waste products.

2. **Understanding the Reason (R)**:
- The reason states that the placenta acts as an endocrine tissue.
- This is also true, as the placenta functions as a temporary endocrine gland, producing important hormones necessary for maintaining pregnancy, such as hCG, progesterone, estrogen, and relaxin.

3. **Evaluating the Relationship**:
- While both the assertion and reason are correct, we need to evaluate whether the reason correctly explains the assertion.
- The assertion focuses on the physical connection and transport functions of the umbilical cord and placenta, while the reason discusses the hormonal functions of the placenta.

4. **Conclusion**:
- Since both statements are correct but the reason does not directly explain the assertion, we conclude that the assertion is true, the reason is true, but the reason does not adequately support the assertion.

5. **Final Answer**:
- Therefore, the correct answer is that both the assertion and reason are correct, but the reason does not correctly explain the assertion.