Question:
Match List-I with List-II:
List-I (Species) List-II (Type of Placenta) (A) Horse (I) Hemochorial (B) Cow (II) Synepitheliochorial (C) Carnivores (III) Endotheliochorial (D) Primates (IV) Epitheliochorial
Choose the correct answer from the options given below:
Match List-I with List-II:
| List-I (Species) | List-II (Type of Placenta) |
|---|---|
| (A) Horse | (I) Hemochorial |
| (B) Cow | (II) Synepitheliochorial |
| (C) Carnivores | (III) Endotheliochorial |
| (D) Primates | (IV) Epitheliochorial |
Choose the correct answer from the options given below:
Show Hint
Remember the histological placental gradient:
- Epitheliochorial (Horse) = No erosion (6 layers).
- Synepitheliochorial (Cow) = Mild erosion.
- Endotheliochorial (Carnivores) = Moderate erosion (4 layers).
- Hemochorial (Primates) = Maximum erosion (3 layers).
Updated On: Aug 4, 2026
- (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
- (A) - (IV), (B) - (II), (C) - (III), (D) - (I)
- (A) - (I), (B) - (IV), (C) - (II), (D) - (III)
- (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Placentae are classified histologically based on the number of tissue layers separating the maternal blood from the fetal blood.
Step 2: Detailed Explanation:
Let us match each species with its histological placental type:
- Horse (A): Possesses an Epitheliochorial placenta. This is the least invasive type, where the chorionic epithelium of the fetus remains in simple apposition with the intact uterine epithelium of the mother (6 tissue layers). This matches with (IV).
- Cow (B): Possesses a Synepitheliochorial placenta (historically grouped under syndesmochorial). In this type, the endometrial epithelium is partially eroded, and binucleate giant cells from the trophoblast fuse with maternal endometrial cells. This matches with (II).
- Carnivores Dogs & Cats (C): Possess an Endotheliochorial placenta. Here, the maternal endometrial epithelium and connective tissue are eroded, leaving the chorionic epithelium in direct contact with the maternal endothelial lining of blood vessels (4 tissue layers). This matches with (III).
- Primates Humans (D): Possess a Hemochorial placenta. This is the most invasive type, where the maternal blood vessel walls are completely eroded, allowing the fetal chorionic villi to bathe directly in pools of maternal blood (3 tissue layers). This matches with (I).
Combining these individual linkages, the matching sequence is (A) - (IV), (B) - (II), (C) - (III), (D) - (I).
Step 3: Final Answer:
The matching sequence is represented by option (B).
Placentae are classified histologically based on the number of tissue layers separating the maternal blood from the fetal blood.
Step 2: Detailed Explanation:
Let us match each species with its histological placental type:
- Horse (A): Possesses an Epitheliochorial placenta. This is the least invasive type, where the chorionic epithelium of the fetus remains in simple apposition with the intact uterine epithelium of the mother (6 tissue layers). This matches with (IV).
- Cow (B): Possesses a Synepitheliochorial placenta (historically grouped under syndesmochorial). In this type, the endometrial epithelium is partially eroded, and binucleate giant cells from the trophoblast fuse with maternal endometrial cells. This matches with (II).
- Carnivores Dogs & Cats (C): Possess an Endotheliochorial placenta. Here, the maternal endometrial epithelium and connective tissue are eroded, leaving the chorionic epithelium in direct contact with the maternal endothelial lining of blood vessels (4 tissue layers). This matches with (III).
- Primates Humans (D): Possess a Hemochorial placenta. This is the most invasive type, where the maternal blood vessel walls are completely eroded, allowing the fetal chorionic villi to bathe directly in pools of maternal blood (3 tissue layers). This matches with (I).
Combining these individual linkages, the matching sequence is (A) - (IV), (B) - (II), (C) - (III), (D) - (I).
Step 3: Final Answer:
The matching sequence is represented by option (B).
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