A. body surface
B. gills
C. buccal cavity
D. spiracle
Correct Answer:
Option A – body surface
Explanation
Protozoa do not have any organelle 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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