Notochord persists throughout the life in

Notochord is persistent throughout life in

Notochord is persistent throughout life in

Notochord is persistent throughout life in

Notochord is present throughout the life is

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.

[A]: Trichomes may occur on all parts of a plant. [R]: Trichomes either persist throughout the life of an organ or are ephemeral

[A]: Trichomes may occur on all parts of a plant. [R]: Trichomes either persist throughout the life of an organ or are ephemeral