AQA A-Level Biology Topic 3 Text Questions and Answers 100% Solved

AQA A-Level Biology Topic 3 Text Questions and Answers 100% Solved 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