Know your science

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Across
  1. 3. Bouncing back of light from a surface.
  2. 4. An expression in which symbols and formulae represent a chemical reaction
  3. 5. Mirror whose reflecting surface is part of a sphere.
  4. 7. Process by which organisms obtain and use food.
  5. 8. Sideways shift of a light ray after passing through a glass slab.
  6. 10. Set of rules used for measuring distances in optics.
  7. 13. Simple sugar that serves as the body's main energy source.
  8. 14. Essential activities that keep living organisms alive.
  9. 15. A substance made up of two or more elements chemically combined.
Down
  1. 1. Plant tissue containing xylem and phloem.
  2. 2. Reaction in which an acid and a base form salt and water.
  3. 6. Artificial purification of blood when kidneys fail.
  4. 9. Substances that change colour to show acidity or basicity.
  5. 11. Number that shows how acidic or basic a substance is.
  6. 12. Bending of light when it passes from one medium to another.