Crossword puzzle on Role of Microorganism

1234567
Across
  1. 5. process used for wastewater treatment.
  2. 6. ability of an organism to resist an infection.
  3. 7. used as fuel for production of energy.
Down
  1. 1. chemicals produced by microorganisms, that kill or inhibit the growth of other
  2. 2. process in which fungi like yeast, reproduce quickly and produces carbon dioxide. Carbon dioxide mixes with the dough or batter and increases its volume and makes it fluffy and soft.
  3. 3. convert the dead remains of plants and animals to humus.
  4. 4. microorganisms.