SCIENCE CORSSWORD PUZZLE

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