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O-Level Movement of Substances

What the O-Level syllabus expects for Movement of Substances, and how to practise it.

What the syllabus expects

Give a definition of diffusion and set out the part it plays in taking up nutrients and in gaseous exchange for both plants and humans.
Give a definition of osmosis, and both investigate and set out how osmosis affects plant and animal tissues.
Give a definition of active transport and talk through why it matters as an energy-using process that shifts substances against a concentration gradient, as seen when root hairs take up ions and cells in the villi take up glucose.

About 16% of the past-paper style questions in Rae's bank for this subject sit in this topic.