Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

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Definition

Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

The definition contains three important statements:

. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

2. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

3. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

It does not matter too much which order you put these statements in. Nor does it matter if you write the definition as one sentence or three sentences. All that matters in your exam is that you make all three points when you explain what osmosis is.
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Explanation

First the definition of osmosis:

. Semi-permeable membranes are very thin layers of material (cell membranes are semi-permeable) which allow some things to pass through them but prevent other things from passing through.

Cell membranes will allow small molecules like Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through. Cell membranes will not allow larger molecules like Sucrose, Starch, protein, etc. to pass through.

2. A region of high concentration of water is either a very dilute solution of something like sucrose or pure water. In each case there is a ...

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