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. Organism which made up of many cells 4. Small disc-like structures found in the cell of green plants. 6. Green substance which absorbs energy from the sun or light. 8. A thick layer around the plant cell which is made of cellulose. 10. Threadlike objects in the nucleus. 12. Organism that only have one cell. 13. Two types of respiration, ________ and anaerobic. 14. A thin layer around the cell. 15. The apparatus used to look at cells. 18. All cells are made of ________.

Down: 2. The waste products of respiration are _________________ and water. 3. Jelly-like substance that fills the cell. 5. _________ controls the activities of the cell. 7. The chemical process where energy is released from the cell. 9. The basic units of all living things 11. Small spaces air, liquid or food particles. 16. Food such as glucose combines with ________ in living cells to release energy needed by the cell. 17. _______ energy is released during respiration.