OCR Yr12 Biology A 3.1.1 Exchange surfaces
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is surface area to volume ratio? | show 🗑
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| show | 1. Size
2. SA:Vol ratio
3. Level of activity
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| Why do many multicellular organisms require specialised exchange surfaces. | show 🗑
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| Describe the SA:Vol ratio of small organisms | show 🗑
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| show | Small SA:Vol ratio
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| show | It limits the overall size of the organism. Most large organisms need a range of tissues for support and strength this increases the thickness and therefore the volume of their bodies.
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| show | 4 pie r squared
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| show | 4/3 pie r cubed
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| show | More oxygen and nutrients are required for energy release in aerobic respiration.
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| Root hairs in a plant are an example of which feature of a good exchange system? | show 🗑
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| show | They are thin and permeable providing a short diffusion pathway for efficient exchange. Alveoli walls are 1 cell thick providing a barrier of only 0.3 micrometers between blood and air.
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| show | It maintains a steep concentration gradient so that diffusion occurs rapidly. Eg. gills in fish.
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