Question

KS
(D) None
49. In sharks, the scales are
(A) Placoid
(B) Cycloid
(C) Ctenoid
(D) Rhomboid
50. In fishes respiration takes place by
(A) Gills
(B) Book lungs
(C) Gills,book lungs & fins
(D) Gills & accessory respiratory organs
51. Study of sharks and rays is known as
(A) Saurology
(B) Traumatology
(C) Torpedology
(D) Ichthyology​

Answer 1

Answer:

49 ) b

50)a

51)a

I think this will help u

Answer 2

Answer:

49.b

50.a

51.a

hope this answers will help you