Class Osteichthyes: Subclass Sarcopterygii and Actinopterygii
Number of living species of Actinopterygii’s is nearly:
30 species
23 species
25 species
55 species
25 species
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Gills in fishes supported by the:A. trachea
B. gill arches
C. gills filaments
D. pharyngeal slits
Only surviving coelacanth is:
A. latimeria
B. hatfish
C. ratfish
D. eels
Lungfishes are included in class
A. Osteichthyes
B. Chondrichthyes
C. elasmobranchii
D. Holocephali
Fishes that migrate between marine and freshwater environment are called:
A. diadromous
B. dual nature
C. neutral species
D. all of above
Function of swim bladder in class Osteichthyes is carried out by:
A. lungs
B. gills
C. pneumatic sacs
D. heart
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