Question

Do all living beings have lungs? (page 85)

Answer 1

Answer:

All living beings do not have lungs.

Explanation:

• Instead of lungs, unicellular organisms exchange gases from the surrounding through their surface of the cell, like plasma membrane.
• In some organisms like earthworms, leeches, etc, exchange of gases takes place through skin.
• In insects, the exchange of gases takes place through tracheae which are tiny fine tubes.
• In aquatic animals, exchange of gases takes place with the help of gills.
• Lungs are found in birds, amphibians, human beings, and mammals.

Answer 2

All living beings don't have lungs

Explanation:

• All living being have different respiratory organs but in case of vertebrates the major respiratory organ is lung.

• Tape worm, earth worm, leeches,amphibians respire through their skin.

• Fishes respire through gills,horse shoe crab respire through book gills.

• Scorpion respire through book lungs which is a specialised organ.

• Insects respire through tracheal system

• Reptiles respire through lungs.