Respiration in chondrichthyes fishes takes place through……pairs of gills.
a) 3-5
b) 4-6
c) 5-7
d) 9-11
Explanation: gills are not covered by operculum
Most of the cartilaginous fishes are……..
a) herbivores
b) carnivores
c) omnivores
d) detritus feeders
Explanation: sharks are active hunters
Which of the following are true about cartilaginous fishes?
a) swim bladder present, sexes are separate, many of them viviparous
b) swim bladder present, hermaphrodite, many of them viviparous
c) swim bladder absent, sexes are separate, many of them viviparous
d) swim bladder present, sexes are separate, many of them oviparous
Which of the following is/are the example/s of chondrichthyes (cartilaginous) fishes?
a) sharks and rays
b) skates and chimaeras
c) whale and dolphin
d) both a and b
The fishes of class osteichthyes are commonly known as …….
a) cartilaginous fishes
b) bony fishes
c) lung fishes
d) jawless fishes
Which of the following are the most successful group of fishes and inhabit all types of aquatic habitats?
a) chondrichthyes
b) osteichthyes
c) lung fishes
d) protostomes
