Q37. 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

1. a(ii) b(iii) c(iv) d(i)

Solution:
(a) 6-15 pairs of gill slits - Cyclostomes
(b) Heterocercal caudal fin - Chondrichthyes
(c) Air bladder - Osteichthyes
(d) Poison sting - Trygon