Level 2 Biology students are learning why cells need to be so small. The concept is around surface area to volume ratio. By cutting the block into different sizes they saw how the rate of diffusion to the centre of the cell is increased the smaller the cell/block becomes. Students learn that when a cell size increases, the surface area increases at a slower rate than the volume. In this practical they used agar to observe diffusion rates, as agar is permeable.
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