The most efficient respiratory structure used by free living protozoan is ________

  • A body surface
  • B gills
  • C buccal cavity
  • D spiracle
jamb 2017biology

The correct answer is A. body surface

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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