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Created by Sam Gunnell
over 5 years ago
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Question | Answer |
Define diffusion | The net movement of particles from a reigon of higher concentration to an area of lower concentration |
Fill in the gap: As an organsism gets bigger, its ______/_______ volume also increases | Surface area/ volume |
What four features of an exchange surface effect the rate of diffusion? | Surface area Thickness Concentration gradient Moistness |
Explain how concentration gradient effects the rate of diffusion | The greater the concentration gradient, the quicker diffusion will take place |
Explain how the thickness of a surface may effect the rate of diffusion | The thinner the surface, the shorter the diffusion pathway so the faster the diffuion is |
Explain why cells must be kept moist | Water will always diffuse out of the cell on the cell surface but if too much water is lost, then the plasma membrane will break down and the cell will die |
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