NEETBotanyAnimal Kingdom
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Scoliodon and Carcharodon have to swim constantly to avoid sinking. Reason (R): They belong 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 and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not 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
A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct. Scoliodon (Dog fish) and Carcharodon (Great white shark) are cartilaginous fishes that must swim constantly to avoid sinking. Reason (R) is also correct and provides the correct explanation for (A). Members of the class Chondrichthyes lack an air bladder, which is a buoyancy-regulating organ. Due to the absence of this organ, they are forced to swim continuously to maintain their position in the water column and avoid sinking. Answer: Both (A) and (R) are correct and (R) is the correct exp