AQA A-Level Biology Topic 3 Already Passed
Why are Microorganisms able to perform exchange via their surface? • have a large surface area to volume ratio • have a short diffusion distance • have low demand How do Microorganisms Obtain Nutrients & Remove Waste? • by exchange via their surface • nutrients (e.g. glucose, oxygen) move in by diffusion via their surface • waste (e.g. carbon dioxide) move out by diffusion via their surface Why can't Animals/Plants perform exchange via their surface? • have a small surface area to volume ratio • multicellular (large diffusion distance and high demand) • impermeable surface (prevent pathogens entering and reduce water loss) • therefore, require specialised Exchange & Transport systems • exchange system = increases rate of diffusion of nutrients in and wastes out • transport system = deliver nutrients and remove waste from all cells
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- Subido en
- 7 de marzo de 2024
- Número de páginas
- 30
- Escrito en
- 2023/2024
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- Examen
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