Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

The table shows the surface area to volume ratios for five agar blocks that have different dimensions but the same volume. These agar blocks may be used to assess diffusion efficiency, with efficiency defined by the time needed for a dye to spread to every part of the block. Which prediction can be made about how the size and dimensions of these blocks affect diffusion efficiency?

  • AThe efficiency of diffusion will decrease as the width of a block increases.
  • BThe efficiency of diffusion will increase as the height of a block increases.
  • CThe efficiency of diffusion will increase as a block of fixed volume is flattened.
  • DThe efficiency of diffusion will decrease as a block of fixed volume is elongated.

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