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Diffusion may be enough in a unicellular organism but not in humans. What is the main reason?

Answer and explanation

Correct answer: In humans all cells are not directly in contact with outside environment

Diffusion is effective over short distances when a cell has a large surface area relative to its volume and is directly exposed to the surroundings. A unicellular organism can exchange gases, water, and dissolved substances across its cell membrane in this way. Humans are large, multicellular organisms; many internal cells lie far from the external environment, and diffusion alone would be too slow to meet their oxygen and nutrient demands. Therefore option A is correct, while the other statements are false.

Related tags

DiffusionMulticellular OrganismsTransportLife ProcessesWorld Of LivingScienceClass 10 Mcq

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