Froggy Jumps SA and Diffusion ChallengeOnline version Test your surface-area-to-volume intuition. by Eve Bellis 1 Which statement best describes surface area to volume (SA:V) ratio? a Total mass divided by surface area b Surface area divided by volume c Volume divided by mass 2 A small organism has a high SA:V ratio. What does this mean? a It loses heat slowly b It has a very thick surface c It exchanges substances quickly 3 As an organism becomes larger, its SA:V ratio: a Increases b Decreases c Doubles 4 Why do larger organisms need specialised exchange surfaces? a Their SA:V ratio is high b Their SA:V ratio is low c They do not need oxygen 5 Which factor does NOT affect rate of diffusion? a Colour of the organism b Temperature c Diffusion distance 6 Which statement is TRUE about diffusion distance? a Increased diffusion distance increases diffusion rate b Diffusion distance has no effect on diffusion c Decreased diffusion distance increases diffusion rate 7 A cell with a high metabolic rate will require: a Less oxygen and fewer nutrients b Faster exchange of materials c A smaller SA:V ratio 8 Why do thin exchange surfaces increase diffusion rate? a They decrease diffusion distance b They are waterproof c They have higher temperatures 9 Which adaptation increases SA:V ratio? a Spherical shape b Rounded edges c Flattened or folded surface 10 In humans, which structure increases surface area for gas exchange? a Alveoli b Liver c Kidneys
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