BI-431
Diffusion
Biology · Secondary 3 · Medium · Diffusion
A student adds a drop of blue dye to one side of a beaker of still water. After 10 minutes, the whole beaker is light blue. Which statement best explains this observation?
- Dye molecules diffuse through the water down a concentration gradient.
- Water molecules diffuse towards the dye against a concentration gradient.
- Dye molecules move by osmosis through the water.
- Water is pumped to mix with the dye using energy.
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