CBSE Class 10 Answered

Animals

Respiratory organs

Sponges

Body surface (Exchange of gases takes place by simple diffusion.)

Coelenterates (Cnidarians)

Example: Hydra

Body surface (Exchange of gases takes place by simple diffusion.)

Ctenophores

Example: Pleurobrachia

Body surface (Exchange of gases takes place by simple diffusion.)

Platyhelminthes (Flatworms)

Only free-living forms

Example: Liver fluke

Body surface (Exchange of gases takes place by simple diffusion.)

Aschelminthes (Roundworms)

Example: Ascaris

Respiratory system is absent.

Annelida

Example: Earthworm

Moist cuticle, gills or modified parapodia

Arthropoda (Terrestrial forms)

Example: Insects

Trachea or book lungs

Arthropoda (Aquatic forms)

Example: Crab

Gills or book gills

Mollusca (Terrestrial forms)

Example: Garden snail

Pulmonary sacs

Mollusca (Aquatic forms)

Example: Unio

Ctenidia or gills

Echinodermata (Different organisms)

• Dermal branchiae/ papulae in starfish
• Peristomial gills in sea urchins
• Genital bursae in brittle star
• Cloacal respiratory trees in holothurians

Hemichordata

Example: Balanoglossus

Gill slits

Fish

Gills

Amphibians

Gills, lungs or skin surface

Reptiles

Lungs

Aves (Birds)

Lungs

Mammals

Lungs