Question

Differentiate between chondrichthyes on the basis of scales and caudal fin in answer​

Answer 1

Characteristics

Chondrichthyes

Osteichthyes

Endoskeleton

Commonly known as cartilaginous fish as they have cartilaginous endoskeleton

Commonly known as bony fish as they have bony endoskeleton

Body size

Large-sized fish

Comparatively smaller in size

Mouth position

Ventral

Terminal (anterior)

Type of scale present on skin

Placoid scales

Scales absent, if present, cycloid scales

Number of gills present

5-7 pairs of gills, not covered by operculum

4 pairs of gills, covered by operculum

Caudal fin

Heterocercal

Homocercal

Excretory waste

Urea

Ammonia

Answer 2

Answer:The answer is below:

Explanation:Chondrichthyes have placoid scales whereas osteichthyes have cycloid and ctenoid scales.

Chondrichthyes have asymmetrical caudal fin whereas osteichthyes have symmetrical caudal fin.