Question

why is diffusion sufficient to meet the oxygen demands of unicellular organisms like Ameoba?​

Answer 1

Answer:

In single-celled organisms the entire surface of the organism is in contact with the environment for the diffusion of substances. Hence only diffusion is needed for movement of food and oxygen in unicellular organisms.

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Answer 2

Explanation:

➡Every living cell requires oxygen for performing cellular respiration. In unicellular organisms (e.g amoeba), the single cell is in direct contact with environment. Oxygen passes into it through diffusion. In simple multicellular organisms (e.g, hydra), every cell may take also oxygen through diffusion from environment. This is not possible in multicellular organisms like humans. The body is covered by dead cells. The living cells are not in contact with the external environment. Air containing intercellular spaces are absent. Therefore, quick diffusion cannot occur. Cell to cell diffusion is a very slow process. Passage of oxygen from lungs to toes through cell to cell diffusion will take about three years. Therefore, diffusion cannot meet the oxygen requirements of multicellular organisms like humans.