Question

“Simple diffusion is sufficient to meet the requirements of single celled organism but not of multicellular organism”. Justify the statement

Answer 1

Answer:

In single celled organisms diffusion is sufficient to meet all their requirements of food, exchange of gases or removal of wastes but it is not in case of multicellular organisms

Explanation:

Answer 2

Answer:

• For the diffusion of substances, the entire surface of single-celled creatures is in contact with their environments; but, in multicellular organisms, not all of the cells may be in direct contact with the environment.

• The surface area to volume ratio of single-celled animals is ideal for the diffusion or exchange of substances between the cell and its environment, and this rate of exchange is sufficient for a unicellular creature.
• The exchange that occurs with the outside or environment only happens through the body surface with the aid of a specialized structure or organ in multicellular organisms due to the low surface area to volume ratio.

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