1. The class name ‘cyclostomata’ means
a) Marine, but reproduction takes place in fresh water
b) Mouth is anterio ventral, suctorial and circular
c) Ectoparasite of fishes
d) Jaws are absent
Explanation: Mouth is anterio ventral, suctorial and circular
2. The study of fishes is called
a) Ichthyology
b) Serpentology
c) Saurology
d) Chonchology
Explanation: The study of fishes is called Ichthyology.
3. (1) Marine with streamlined body
(2) Cartilaginous endoskeleton
(3) Mouth is ventral
(4) Caudal fin in Heterocercal
(5) Notochord is persistent throughout life
The above characters belong to which of the following organism (select the total number)?
Dog fish, Saw fish, Flying fish, Fighting fish, Angle fish, Jelly fish, Star fish, Trygon, Torpedo,
Rohu, Catla, Magur
a) 3
b) 4
c) 6
d) 7
Explanation: 4
4. The scales found in chondrichthyes is/are
a) Placoid
b) Cycloid
c) Ctenoid
d) All of these
Explanation: Placoid
5. Which of the following is incorrect about cartilaginous fish?
a) Teeth are modified with placoid scales which are backwardly directed.
b) 5 to 7 pair of gills for respiration but without operculum (i.e., gill cover).
c) Air bladder is absent so they have to swim constantly to avoid sinking.
d) In males, the pelvie fins claspers are absent.
Explanation: "In males, the pelvie fins claspers are absent". This is incorrect about cartilaginous fish.
6. Select the total number of organism which posses two chambered heart and are poikilothermal.
Scoliodon, Pristis, Clarias, Betta, Pterophyllum, Echinus, Devil Fish, Cuttle fish, Sea lily,
Hyla, Labeo, catla, Torpedo, Trygon
a) 7
b) 9
c) 11
d) 13
Explanation: 9
7. Select the difference which is wrongly written:
Cartilaginous fish Bony fishes
a) Operculum is absent – Operculum is present
b) Fertilization is internal – Fertilization is external
c) Posses 5–7 pair of gills – Posses 4 pair of gills
d) Mostly oviparous – Mostly viviparous
Explanation: Mostly oviparous – Mostly viviparous
8. Which fish possess poison sting?
a) Scoliodon (dog fish)
b) Trygon
c) Torpedo
d) Pristis (saw fish)
Explanation: Trygon fish possess poison sting.
9. Which fish possess electric organs?
a) Scoliodon (dog fish)
b) Trygon
c) Torpedo
d) Pristis (saw fish)
Explanation: Torpedo fish possess electric organs.
10. Males possess claspers in pelvic fins in class _____
a) Cyclostomata
b) Chondrichthyes
c) Osteicthyes
d) Amphibia
Explanation: Chondrichthyes