Podcast
Questions and Answers
Why is it important for an organism's exchange surface to be large compared to its volume?
Why is it important for an organism's exchange surface to be large compared to its volume?
To allow for efficient exchange of materials
Why can simple diffusion across the outer surface only meet the needs of relatively inactive organisms?
Why can simple diffusion across the outer surface only meet the needs of relatively inactive organisms?
Because as organisms become larger, their volume increases at a faster rate than their surface area
What are some features organisms have evolved to increase their surface area to volume ratio?
What are some features organisms have evolved to increase their surface area to volume ratio?
Flattened shape and specialised exchange surfaces
How does the flattened shape of some organisms aid in efficient exchange?
How does the flattened shape of some organisms aid in efficient exchange?
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What is the disadvantage of relying solely on diffusion for transport across the outer surface of an organism?
What is the disadvantage of relying solely on diffusion for transport across the outer surface of an organism?
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Why do small organisms have a surface area that is large enough, compared with their volume, to allow efficient exchange?
Why do small organisms have a surface area that is large enough, compared with their volume, to allow efficient exchange?
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What are the key characteristics of effective exchange surfaces that allow efficient transfer of materials?
What are the key characteristics of effective exchange surfaces that allow efficient transfer of materials?
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Why are exchange surfaces often located inside an organism's body?
Why are exchange surfaces often located inside an organism's body?
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How does a large surface area to volume ratio increase the rate of exchange?
How does a large surface area to volume ratio increase the rate of exchange?
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Express the relationship between diffusion rate and the factors that affect it using the equation provided.
Express the relationship between diffusion rate and the factors that affect it using the equation provided.
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Why is it important for exchange surfaces to be selectively permeable?
Why is it important for exchange surfaces to be selectively permeable?
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What role does ventilation play in organisms with internal exchange surfaces?
What role does ventilation play in organisms with internal exchange surfaces?
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