chap2

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Across
  1. 2. Substance used to produce immunity in living body
  2. 4. Healthy bacteria
  3. 6. Short form of polio vaccine
  4. 8. Air-borne disease caused by bacteria
  5. 9. Spirogyra is an example of
Down
  1. 1. Disease – causing microbe
  2. 3. This is a substance present in the blood that helps to provide immunity
  3. 5. Dry fruits and vegetables are preserved by this method
  4. 7. Tobacco mosaic plant disease caused by
  5. 8. Micro-organisms produce __________ in the food items they grow