The most efficient respiratory structure used by free living protozoan is ________
-
body surface
- gills
- buccal cavity
- spiracle
The correct answer is: A
Explanation
Protozoa do not have any organellae for the process of respiration. The limiting permeable membrane (body surface) acts as a respiratory surface.The free molecular oxy¬gen from the surrounding media enters into the body by diffusion. Presence of a cyto¬chrome system has been demonstrated in protozoa.
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