LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Large organisms have a much smaller surface area to volume ratio compared to smaller ones.
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Diffusion does not work in large multicellular organisms.
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Unicellular organisms have a much smaller surface area to volume ratio than multicellular organisms
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Detailed explanation-1: -As the size of an organism increases, its surface area to volume ratio decreases. This means it has relatively less surface area available for substances to diffuse through, so the rate of diffusion may not be fast enough to meet its cells requirements.
Detailed explanation-2: -Answer and Explanation: Multicellular organisms need efficient transportation systems because simple diffusion would be too slow to transport nutrients and remove waste. In single celled organisms, simple diffusion carries metabolic waste out of the cell and allows for the transport of nutrients into the cell.
Detailed explanation-3: -The multicellular organisms need a unique circulatory system inside their body because most body cells cannot directly interact with the outside environment. Thus an internal arrangement is required to transfer the essential nutrients and oxygen to every body cell for proper growth and nourishment.
Detailed explanation-4: -A circulatory system is not needed in organisms with no specialized respiratory organs, such as unicellular organisms, because oxygen and carbon dioxide diffuse directly between their body tissues and the external environment.
Detailed explanation-5: -Multicellular organisms require exchange surfaces and a transport system in order for substances to pass in and out of the cells. The larger the surface area is to the volume, the quicker and more substances can pass through the membranes.