(i) All living members of this class are ectoparasites on some fishes, |
(ii) They have a sucking and circular mouth without jaws. |
(iii) Circulation is of closed type. |
(iv) They are marine but migrate for spawning to fresh water. After spawing, within a few days they die. |
A) Cyclostomata
B) Chondrichthyes
C) Osteichthyes
D) Amphibia
Correct Answer: A
Solution :
[a] Cyclostomata is a group of chordates that includes the living jawless fishes: the lampreys and hagfishes. The name cyclostomata means "round mouths". Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.You need to login to perform this action.
You will be redirected in
3 sec