Given below are two statements.
Statement I Osteichthyes have to swim constantly to avoid sinking due to absence of air bladder.
Statement II Osteichthyes have four pairs of gills, which are covered by an operculum on each side.
In the light of the above statements, choose the correct answer from the options given below.
Text Solution
Verified by ExpertsA
Statement I is incorrect, but statement II is correct. Incorrect statement can be corrected as
Chondrichthyes are marine animals with streamlined body and have cartilaginous endoskeleton. Due to the absence of air bladder, they have to swim constantly to avoid sinking. Air bladder is present in Osteichthyes which regulates buoyancy.
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