Question:
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Sharks are categorized under the class Elasmobranchii.
Reason (R) : Sharks have gill slits positioned laterally on either side of the head.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Sharks are categorized under the class Elasmobranchii.
Reason (R) : Sharks have gill slits positioned laterally on either side of the head.
In light of the above statements, choose the most appropriate answer from the options given below.
Assertion (A) : Sharks are categorized under the class Elasmobranchii.
Reason (R) : Sharks have gill slits positioned laterally on either side of the head.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Remember: "Elasmobranch" means plate-gilled, referring to the exposed gill slits. Sharks have them laterally, while rays have them ventrally.
Updated On: Jul 21, 2026
- Both (A) and (R) are correct and (R) is the correct explanation of (A).
- Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
- (A) is correct but (R) is not correct.
- (A) is not correct but (R) is correct.
Show Solution
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Taxonomic classification of cartilaginous fishes (Chondrichthyes) is based on skeletal structures, jaw suspension, and respiratory openings.
The subclass Elasmobranchii includes sharks, skates, and rays, which are characterized by having separate, visible gill slits exposed to the outside.
Step 2: Detailed Explanation:
Let us analyze both statements:
- Assertion (A): Sharks are indeed categorized under the subclass Elasmobranchii (within the class Chondrichthyes), which is correct.
- Reason (R): Sharks possess 5 to 7 pairs of gill slits that are positioned laterally on either side of the head. This distinguishes them from skates and rays (Batoidea), which have ventrally located gill slits. This statement is correct.
- Connection: While both statements are correct, the lateral position of the gill slits is a diagnostic feature used to distinguish sharks from rays, but it is not the fundamental reason why they are classified as Elasmobranchii. Elasmobranchs as a whole are defined by having a cartilaginous skeleton, placoid scales, lack of a swim bladder, and multiple exposed gill slits without an operculum (which can be either lateral or ventral).
Therefore, both statements are correct, but (R) is not the correct biological explanation of (A).
Step 4: Final Answer:
Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
Taxonomic classification of cartilaginous fishes (Chondrichthyes) is based on skeletal structures, jaw suspension, and respiratory openings.
The subclass Elasmobranchii includes sharks, skates, and rays, which are characterized by having separate, visible gill slits exposed to the outside.
Step 2: Detailed Explanation:
Let us analyze both statements:
- Assertion (A): Sharks are indeed categorized under the subclass Elasmobranchii (within the class Chondrichthyes), which is correct.
- Reason (R): Sharks possess 5 to 7 pairs of gill slits that are positioned laterally on either side of the head. This distinguishes them from skates and rays (Batoidea), which have ventrally located gill slits. This statement is correct.
- Connection: While both statements are correct, the lateral position of the gill slits is a diagnostic feature used to distinguish sharks from rays, but it is not the fundamental reason why they are classified as Elasmobranchii. Elasmobranchs as a whole are defined by having a cartilaginous skeleton, placoid scales, lack of a swim bladder, and multiple exposed gill slits without an operculum (which can be either lateral or ventral).
Therefore, both statements are correct, but (R) is not the correct biological explanation of (A).
Step 4: Final Answer:
Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
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