First slide

Respiratory Organs

Question

How many of the following organisms exchange $O_{2}$ with ${CO}_{2}$ by simple diffusion over their entire body surface?
a. Insects
b. Flatworms
c. Earthworms
d. Coelenterates
e. Molluscs
f. Sponges

Easy

A

Five
B

Four
C

Six
D

Two

Solution

Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange $O_{2}$ with ${CO}_{2}$ by simple diffusion over their entire body surface. Earthworms use their moist cuticle.
Insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body. Special vascularised structures called gills (branchial respiration) are used by most of the aquatic arthropods and molluscs

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