How many of the characteristics/examples given below are related to Chondrichthyes?
Ventral mouth, Operculum, Cycloid scales, Air bladder, Placoid scales, Carcharodon, Betta
Text Solution
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Chondrichthyes are marine animals with streamlined body and have cartilaginous endoskeleton.
Mouth is located ventrally. Notochord is persistent throughout life.
Gill slits are separate and without operculum (gill cover).
The skin is tough, containing minute placoid scales. Teeth are modified placoid scales which are backwardly directed.
Due to the absence of air bladder, they have to swim constantly to avoid sinking.
Examples: Scoliodon (Dog fish), Pristis (Saw fish), Carcharodon (Great white shark), Trygon (Sting ray).
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