Question:
Given below are two statements :
Statement (I) : Pleurobranchs of a typical prawn are attached to abdominal segments bearing pleopods.
Statement (II) : A typical prawn has three pleurobranchs.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements :
Statement (I) : Pleurobranchs of a typical prawn are attached to abdominal segments bearing pleopods.
Statement (II) : A typical prawn has three pleurobranchs.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I) : Pleurobranchs of a typical prawn are attached to abdominal segments bearing pleopods.
Statement (II) : A typical prawn has three pleurobranchs.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Prawn gills are strictly thoracic organs. Pleurobranchs = attached to the lateral thoracic wall, and there are exactly 5 pairs of them in a typical prawn.
Updated On: Jul 21, 2026
- Both Statement (I) and Statement (II) are true.
- Both Statement (I) and Statement (II) are false.
- Statement (I) is true but Statement (II) is false.
- Statement (I) is false but Statement (II) is true.
Show Solution
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
In decapod crustaceans like prawns, the respiratory system consists of gills located inside the branchial chambers on either side of the cephalothorax.
The gills are classified into three types based on their point of attachment: podobranchs, arthrobranchs, and pleurobranchs.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
- Statement (I): Pleurobranchs (also known as wall-gills) are attached directly to the lateral wall of the thoracic segments (cephalothorax), not the abdominal segments bearing pleopods. Abdominal segments do not possess gills; instead, their pleopods are used for swimming. Therefore, Statement (I) is false.
- Statement (II): In a typical prawn (such as the freshwater prawn Palaemon or marine penaeid prawns like Penaeus), there are five pairs of pleurobranchs, one attached to the lateral wall of each of the five segments bearing the walking legs (pereiopods). They do not have only three pleurobranchs. Therefore, Statement (II) is false.
Since both Statement (I) and Statement (II) are false, the correct option is (B).
Step 4: Final Answer:
Both Statement (I) and Statement (II) are false.
In decapod crustaceans like prawns, the respiratory system consists of gills located inside the branchial chambers on either side of the cephalothorax.
The gills are classified into three types based on their point of attachment: podobranchs, arthrobranchs, and pleurobranchs.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
- Statement (I): Pleurobranchs (also known as wall-gills) are attached directly to the lateral wall of the thoracic segments (cephalothorax), not the abdominal segments bearing pleopods. Abdominal segments do not possess gills; instead, their pleopods are used for swimming. Therefore, Statement (I) is false.
- Statement (II): In a typical prawn (such as the freshwater prawn Palaemon or marine penaeid prawns like Penaeus), there are five pairs of pleurobranchs, one attached to the lateral wall of each of the five segments bearing the walking legs (pereiopods). They do not have only three pleurobranchs. Therefore, Statement (II) is false.
Since both Statement (I) and Statement (II) are false, the correct option is (B).
Step 4: Final Answer:
Both Statement (I) and Statement (II) are false.
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