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One term, and every place the course uses it — the revision notes that teach it, the multiple choice questions that check it, and the detailed questions that examine it.

11 sub-topics use osmosis

  1. AQA · Biology · 4.1 Cell biology

    4.1.3Transport in cells

    Water moves across cell membranes by osmosis. Osmosis is the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane. "Partially permeable" means the membrane lets water through

    in Osmosis and 3 other sections

    Study notes4Multiple choice88Detailed questions18

  2. AQA · Biology · 4.2 Organisation

    4.2.3Plant tissues, organs and systems

    adapted to it. Root hair cells are adapted for the efficient uptake of water by osmosis, and of mineral ions by active transport — the long thin extension gives a large surface area, and the many mitochondria

    in Plant organ system and 1 other section

    Study notes2Multiple choice22Detailed questions8

  3. AQA · Biology · 4.5 Homeostasis and response

    4.5.3Hormonal coordination in humans

    body fluids act directly on cells. If body cells lose or gain too much water by osmosis they do not function efficiently: in fluid that is too dilute water enters and the cell swells

    in Maintaining water and nitrogen balance

    Study notes1Multiple choice6Detailed questions3

  4. AQA · Biology · 4.1 Cell biology

    4.1.1Cell structure

    Used in 14 questions on this sub-topic.

    Study notesMultiple choice12Detailed questions2

  5. AQA · Biology · 4.4 Bioenergetics

    4.4.1Photosynthesis

    living processes Starch Insoluble, so it stores well without affecting the water balance of the cell by osmosis Fats and oils A dense energy store, common in seeds Cellulose Strengthens the cell wall Amino acids, then

    in Uses of glucose from photosynthesis and 1 other section

    Study notes2Multiple choice7Detailed questions2

  6. AQA · Biology · 4.1 Cell biology

    4.1.2Cell division

    Used in 6 questions on this sub-topic.

    Study notesMultiple choice6

  7. AQA · Biology · 4.5 Homeostasis and response

    4.5.1Homeostasis

    reaction slows or stops. Cells also need a steady water concentration: too dilute and water enters by osmosis until the cell swells, too concentrated and water leaves until it shrinks. Either way the reactions inside stop

    in Homeostasis

    Study notes1Multiple choice2Detailed questions1

  8. AQA · Biology · 4.3 Infection and response

    4.3.3Plant disease

    Used in 3 questions on this sub-topic.

    Study notesMultiple choice3

  9. AQA · Biology · 4.5 Homeostasis and response

    4.5.4Plant hormones

    Used in 3 questions on this sub-topic.

    Study notesMultiple choice3

  10. AQA · Biology · 4.4 Bioenergetics

    4.4.2Respiration

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1

  11. AQA · Biology · 4.6 Inheritance, variation and evolution

    4.6.1Reproduction

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1