Across
- 4. A space within a cell that is empty of cytoplasm, lined with a membrane, and filled with fluid.
- 5. Light from the sun.
- 7. A chemical reaction that happens in cells.
- 8. An optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times.
- 9. A colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air
- 14. Any of a number of organised or specialised structures within a living cell.
- 17. Membrane The thin layer surrounding the cell.
- 18. The lens or group of lenses that is closest to the eye in a microscope, telescope, or other optical instrument.
- 19. A simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.
- 20. The organelle where photosynthesis occurs.
Down
- 1. Dioxide A colourless, odourless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 per cent) and is absorbed by plants in photosynthesis.
- 2. A mass of cytoplasm that is bound externally by a cell membrane.
- 3. A colourless, transparent, odourless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.
- 6. A double membrane-bound organelle found in most eukaryotic organisms.
- 10. The flat plate where the slides are placed for observation on a compound microscope.
- 11. A usually round part of most cells that is enclosed in a double membrane.
- 12. An organelle within the cells of plants and certain algae that is the site of photosynthesis.
- 13. Wall A boundary or wall that is part of the outer structure of certain cells.
- 15. The ability to do work.
- 16. The process used by plants and other organisms to convert light energy into chemical energy.