Question

Assertion (A): Placenta of human beings is called haemochorial type.
Reason (R): Chorionic villi of the foetus comes into direct contact with the maternal blood.
Identify the correct option from the following:

• A. Both (A) and (R) are true, and (R) is correct explanation of (A)
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

In assertion-reason questions, always verify both statements individually first, then assess whether the reason logically supports the assertion.

Answer 1

The Correct Option is A

Step 1: Understand the assertion.
Human placenta is indeed of the haemochorial type, meaning the chorionic villi are bathed directly in maternal blood. Step 2: Understand the reason.
Chorionic villi of the fetus come into direct contact with maternal blood in a haemochorial placenta, which defines the type. Step 3: Evaluate the logic.
The reason correctly explains the assertion. The defining feature of a haemochorial placenta is the direct contact of fetal villi with maternal blood, without any maternal tissue layers intervening. Conclusion: Both assertion and reason are true, and the reason correctly explains the assertion. Hence, the correct answer is Option 1.