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BIOLOGY

JAMB 2017 - Question 40

Biology 2017 JAMB Past Questions - Question 40: The most efficient respiratory structure used by free living protozan is

Choose the most appropriate option for the gap .

The most efficient respiratory structure used by free living protozan is

A: body surface

B: gills

C: buccal cavity

D: spiracle

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Correct Answer

Explanation

Protozoans have large surface area represented by the cell membrane and small volume as represented by the single cell or protoplasm. In unicellular organism, the surface area to volume ratio is high. Thus diffusion process is enough to distribute materials through the body of the organism. Protozoans do not have specialized excretory organ as obtained in multicellular organisms.