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Why is exchange of substances relatively simple in unicellular organisms?

Answer and explanation

Correct answer: Because the whole cell is in contact with the external environment

The governing concept is diffusion in unicellular organisms. A unicellular organism consists of one small cell, and its cell membrane is directly exposed to the surrounding medium. The distance from the membrane to the cell interior is short, so oxygen, nutrients and wastes can move mainly by diffusion. A complex transport system is unnecessary. Thus option A is correct; the other choices describe organs or tissues absent from such organisms.

Related tags

Unicellular OrganismsDiffusionExchangeLife ProcessesWorld Of LivingScienceClass 10 Mcq

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