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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.

15 sub-topics use osmosis

  1. Edexcel · Biology · 1 Key concepts in biology

    1.3Transport into and out of 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 choice82Detailed questions18

  2. Edexcel · Biology · 6 Plant structures and their functions

    6.2Transport in plants

    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

    Study notes1Multiple choice22Detailed questions8

  3. Edexcel · Biology · 7 Animal coordination, control and homeostasis

    7.5The kidney and osmoregulation

    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 choice2Detailed questions2

  4. Edexcel · Biology · 1 Key concepts in biology

    1.1Cells and microscopy

    Used in 14 questions on this sub-topic.

    Study notesMultiple choice12Detailed questions2

  5. Edexcel · Biology · 7 Animal coordination, control and homeostasis

    7.1Hormones and the endocrine system

    Used in 4 questions on this sub-topic.

    Study notesMultiple choice3Detailed questions1

  6. Edexcel · Biology · 6 Plant structures and their functions

    6.1Photosynthesis

    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

    Study notes1Multiple choice7Detailed questions2

  7. Edexcel · Biology · 8 Exchange and transport in animals

    8.1Exchange surfaces and diffusion

    Used in 7 questions on this sub-topic.

    Study notesMultiple choice7

  8. Edexcel · Biology · 2 Cells and control

    2.1Cell division and growth

    Used in 6 questions on this sub-topic.

    Study notesMultiple choice6

  9. Edexcel · Biology · 7 Animal coordination, control and homeostasis

    7.3Homeostasis and thermoregulation

    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 choice4Detailed questions1

  10. Edexcel · Biology · 5 Health, disease and the development of medicines

    5.2Plant defences and plant disease

    Used in 3 questions on this sub-topic.

    Study notesMultiple choice3

  11. Edexcel · Biology · 6 Plant structures and their functions

    6.3Plant hormones

    Used in 3 questions on this sub-topic.

    Study notesMultiple choice3

  12. Edexcel · Biology · 3 Genetics

    3.2DNA and protein synthesis

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1

  13. Edexcel · Biology · 7 Animal coordination, control and homeostasis

    7.4Blood glucose and diabetes

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1

  14. Edexcel · Biology · 8 Exchange and transport in animals

    8.3Respiration

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1

  15. Edexcel · Biology · 9 Ecosystems and material cycles

    9.4Material cycles and decay

    Used in 1 question on this sub-topic.

    Study notesMultiple choice1