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
(iii) (iv) (i) (ii)
(iv) (ii) (iii) (i)
(i) (iv) (iii) (ii)
(ii) (iii) (iv) (i)
(a) Cyclostomes have 6-15 pairs of gill slits for respiration . (b) Members of Class Chondrichthyes (cartilaginous fishes) possess a heterocercal caudal fin (this is a standard characteristic, though the provided text mentions 'placoid scales' and 'cartilaginous endoskeleton' ). (c) Class Osteichthyes (bony fishes) is characterised by the presence of an air bladder which regulates buoyancy . (d) Trygon (Sting ray), a member of Chondrichthyes, possesses a poison sting . Therefore, the correct match is a-ii, b-iii, c-iv, d-i.
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