Bony Fish Characteristics — NEET Biology
✅ Asked in NEET 2024It 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.
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
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