Name: Phylum Cnidaria: Classes Scyphozoa and Staurozoa
Uploaded: 2019-07-19
Duration: 6 min 54 s
Description: The Scyphozoans are the "true jellyfish," possibly the most widely recognized Cnidarians, while the Staurozoans are the "stalked jellyfish". Let's learn about them all now!

Question

Listed below are eleven characteristics (i-xi) in Column I and the five classes (a-e) of Chordata in Column II. Match at least two characteristics with each class.

Column I (Characteristics)	Column II (Classes)
(i) Three chambered heart	(a) Pisces
(ii) Feathers	(b) Amphibia
(iii)Two-chambered heart	(c) Reptilia
(iv) Eardrum in a pit	(d) Aves
(v) Scales	(e) Mammals
(vi) External ears
(vii) Gills
(viii) Moist skin
(ix) Horny scales on the skin
(x) Homeothermal
(xi) Testes in the scrotum

Accepted Answer

Pisces- (iii), (vii), (v)

The class Pisces includes fishes. These are completely adapted to aquatic life. These have a two-chambered heart, breath by means of gills. Their body is covered with scales. These have fins but no limbs.

Amphibia- (i), (viii)

Amphibians live partly on land and partly in the water. These have a smooth, non-scaly moist, slimy skin and three-chambered heart. They breathe by means of gills. But their adults breathe by means of lungs.

Reptilia- (ix), (iv)

Reptiles are completely adapted to life on land. Their eggs have a leathery shell. These have rough, horny scales on the skin. The eardrum lies at the bottom of a tubular depression.

Aves- (ii), (x)

All birds belong to this class. These have an exoskeleton of feathers. Their fore-limbs are modified into wings. These are warm-blooded or homeothermic.

Mammals- (xi), (vi)

Mammals are the most highly developed animals for life on land. These give birth to young ones. These have a mammary gland which produces milk for young ones. These have external ears (pinnae) and external testes contained in a scrotum (testicles).

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