The most efficient respiratory structure used by free living protozoan is ________
-
A.
body surface -
B.
gills -
C.
buccal cavity -
D.
spiracle
Correct Answer: Option 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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