Air Bladder in Fish — NEET Biology
📚 Practice ConceptHow important is the presence of air bladder in Pisces?
Assertion (A): Cartilaginous fishes have adapted their swimming behavior for survival. Reason (R): Constant swimming depends on the absence of air bladder for buoyancy control.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms cartilaginous fishes swim constantly as adaptation (Assertion true). NCERT states “Due to the absence of air bladder, they have to swim constantly to avoid sinking” (Reason true). The Reason explains the dependency - constant swimming behavior depends on lacking the buoyancy control mechanism that other fishes have, explaining WHY this behavior evolved.
What does NCERT say about How important presence air?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.