Bony Fish Characteristics — NEET Biology
✅ Asked in NEET 2024Match List I with List II: List I: A. Pleurobrachia, B. Radula, C. Stomochord, D. Air bladder; List II: I. Mollusca, II. Ctenophora, III. Osteichthyes, IV. Hemichordata. Choose the correct option. NEET Year: NEET 2024
Match List I with List II: List I: A. Pleurobrachia, B. Radula, C. Stomochord, D. Air bladder; List II: I. Mollusca, II. Ctenophora, III. Osteichthyes, IV. Hemichordata. Choose the correct option. NEET Year: NEET 2024
Answer & NCERT explanation
Correct answer: A — A–II, B–I, C–IV, D–III
Pleurobrachia belongs to Ctenophora (comb jellies), Radula is the feeding organ of Mollusca, Stomochord is found in Hemichordata as a hollow structure, and Air bladder is present in Osteichthyes (bony fish) for buoyancy control. This gives us A-II, B-I, C-IV, D-III as the correct matching.
Read more NCERT concept on the PYQ
It includes both marine and fresh water fishes with bony endoskeleton. Their body is streamlined. Mouth is mostly terminal. They have four pairs of gills which are covered by an operculum on each side. Skin is covered with cycloid/ctenoid scales. Air bladder is present which regulates buoyancy. Heart is two-chambered (one auricle and one ventricle). They are cold-blooded animals. Sexes are separate. Fertilisation is usually external. They are mostly oviparous and development is direct.
NTA focuses on the air bladder's role in buoyancy regulation in bony fishes, as it distinguishes them from other aquatic vertebrates. Students often confuse the air bladder with the swim bladder terminology or forget that it controls buoyancy by regulating gas volume. The key mistake is thinking the air bladder is for breathing—it isn't; gas exchange occurs through gills. Remember: air bladder = buoyancy control, gills = respiration. Also note that bony fishes have a two-chambered heart, external fertilization, and direct development—these character combinations appear frequently in comparative classification questions on NEET.
What does NCERT say about It includes both marine?
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Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.