Science Holiday Homework

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Across
  1. 4. : Slow eating away of metals due to air and moisture.
  2. 6. : Insoluble solid formed during a chemical reaction.
  3. 9. : Band of seven colours obtained when white light passes through a prism.
  4. 11. : Thread-like structure that carries hereditary information.
  5. 12. : Chemical messenger secreted by endocrine glands.
  6. 14. : Light-sensitive layer of the eye on which the image is formed.
  7. 15. : Substance that changes the rate of a chemical reaction without being consumed.
Down
  1. 1. : Process by which green plants prepare food using sunlight.
  2. 2. : Tiny air sacs in the lungs where exchange of gases takes place.
  3. 3. : Defect of vision in which distant objects cannot be seen clearly.
  4. 5. : Process involving addition of oxygen or removal of hydrogen.
  5. 7. : Metal or graphite rod used in electrolysis.
  6. 8. : Structural and functional unit of the kidney.
  7. 10. : Bending of light when it passes from one transparent medium to another.
  8. 13. : Transparent glass object used to disperse white light.