Which of the following fins are present in bony fishes?
a) dorsal fin, anal fin and caudal fin
b) pelvic and pectoral fins
c) both a and b
d) either a or b
Explanation: dorsal, anal and caudal are median fins while pectoral and pelvic fins are paired fins
Which of the following are the characteristic features of bony fishes?
a) swim bladder present, respire through gills, gills covered by operculum
b) swim bladder absent, respire through gills, gills covered by bony operculum
c) swim bladder present, respire through lungs, gills are absent
d) swim bladder absent, respire through gills, covered by cartilaginous operculum
Brain in osteichthyes is well developed and consists of …pairs of cranial nerves.
a) 5
b) 10
c) 12
d) 31
The heart of the bony fishes consists of…
a) one auricle and one ventricle
b) two auricles and two ventricles
c) one auricle and two ventricles
d) two auricles and one ventricles
Which of the following is/are true about osteichthyes (bony) fishes?
a) blood contains haemoglobin
b) sexes are separate
c) mostly fertilization is external
d) all of these
Explanation: the national fish of Pakistan is Mahasheer
Majority of the bony fishes are ………
a) oviparous
b) viviparous
c) ovoviviparous
d) both a and b
Explanation: some are ovoviviparous
