Match the following columns and select the correct option. Column-I (a) 6-15 pairs of gill slits (b) Heterocercal caudal fin (c) Air Bladder (d) Poison sting Column-II (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
Cyclostomes have an elongated body bearing 6-15 pairs of gill slits for respiration, so (a) matches with (ii) in column-II. Air bladder is present in bony fishes belonging to class Osteichthyes which regulates buoyancy, so (c) matches with (iv) in column-II. Trygon, a cartilaginous fish, possesses poison sting, so, (d) matches with (i) in column-II. Heterocercal caudal fin is present in members of class Chondrichthyes, so (b) matches with (iii) in column-I.
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