Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 1. Structure which expels excess water from a unicellular animal's body. (11,7) 3. Term used to describe a plant cell whose contents have shrunk due to water loss. (11) 4. Movement of molecules from a region of high concentration to a region of low concentration. (9) 5. A very small particle of a substance. (8) 8. Term used to describe an organism consisting of more than one cell. (13) 9. Term used to describe a plant cell swollen with water. (6) 10. Term used to describe a cell which is soft due to lack of water. (7) 11. Term used to refer to a structure that does not allow molecules in solution to pass through it. (11)

Down: 2. Synthetic material containing tiny pores. (7,6) 6. Movement of water molecules from a high water concentration to a low water concentration across a selectively permeable membrane. (7) 7. Term used to describe an organism consisting of one cell. (11)