Part 1 of 3

Diffusion and cell size

define

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define: give the precise meaning.

Which statement describes diffusion?

Choose one answera.Movement of particles from low to high concentration, using energy from respirationb.Net movement of particles from higher to lower concentration, as a result of their random movementc.Movement of water only, through a membraned.Particles moving in one direction only, towards where there is more space

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Cambridge IGCSE Biology 0610 · 2026–2028 v3 · Original learning materials.

Diffusion as the net movement of particles down a concentration gradient, its energy and the four factors (3.1.1, 3.1.2, 3.1.5) through the agar-cube practical; diffusion through cell membranes and its importance for gases and solutes (3.1.3, 3.1.4); active transport (3.3.1) with root hairs and protein carriers (Supplement 3.3.2–3.3.3). Osmosis is in the next module. Times in the experiment come from a teaching model.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus