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