NEETBotanyAnimal Kingdom
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Scoliodon has to swim constantly to avoid sinking. Reason (R): It belongs to class Chondrichthyes, which lack an air bladder. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Scoliodon (Dog fish) is a marine cartilaginous fish belonging to the class Chondrichthyes. Members of Chondrichthyes lack an air bladder, an organ responsible for regulating buoyancy in bony fishes (Osteichthyes). Due to the absence of an air bladder, cartilaginous fishes like Scoliodon do not have natural buoyancy and must swim constantly to avoid sinking. Thus, both the assertion and the reason are true, and the reason correctly explains the assertion. Answer: Both (A) and (R) are correct and (R) is the correct e