Question

In single celled organisms diffusion is sufficient to meet all requirements of food, exchange of gases or removal of wastes but it is not in multicellular organisms. Explain the reason for this difference

Answer 1

Explanation:

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In unicellular organisms there is only one cell which governs the all the activities of the cell so only through diffusion materials like gases, water etc can exchange between the environment and the cell.

It does not require any special system through which exchange takes place.

But in case of a multicellular organisms there is separate system for separate function. Many cells clustered together to form tissues, tissues to organs and organs to organ system. So through diffusion the process of exchange of materials between the organism and the environment is not fulfilled

Multicellular organisms have a complicated system so diffusion is not the process which can fulfil the requirements of the organisms.

For instance, in human beings diffusion of gas from the head to the feet can take up to 3 years.

Therefore, diffusion is not efficient in performing different functions that are required for a multicellular organism to live.

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