# Explain why water moves out of a plant root hair cell when it is placed in a concentrated salt solution.

> Eduqas GCSE Biology — 1.1.2 Movement of substances · Explain · 4 marks

> A plant root hair cell contains a dilute solution inside its vacuole. When the cell is placed in a concentrated salt solution, water moves out of the cell.

## Mark scheme (4 marks)

1. The process by which water moves is osmosis
2. Water moves from a region of high water concentration to a region of low water concentration
3. The salt solution outside has a lower water concentration than the cell contents
4. Water moves out through the partially permeable membrane

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