Decomposers in Nature MCQ App | IGCSE O Level Biology MCQ e-Book PDF
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Free "Decomposers in Nature MCQ" App Download: After decomposition of household sewage, the dried substance results in; MCQ with answers: sludge, fertilizer, and land fill. Practice Decomposers in Nature Quiz Questions, download Google e-Book (Free Chapter) to excel in biology education.

Decomposers in Nature MCQs PDF Download – Prep Test

MCQ 1: After decomposition of household sewage, the dried substance results in:

  1. sludge
  2. fertilizer
  3. land fill
  4. all of above

MCQ 2: Before discharging decomposed sewage into rivers and seas, the:

  1. water is filtered only
  2. pathogens are removed only
  3. pH of sewage is neutralized
  4. water is filtered and pathogens are removed

MCQ 3: Inorganic gases released during decomposition includes:

  1. carbon dioxide
  2. hydrogen sulphide
  3. water vapors
  4. all of above

MCQ 4: Inorganic salts released during decomposition include:

  1. nitrate
  2. sulfate
  3. phosphate
  4. all of above

MCQ 5: Biogas includes none ,but:

  1. carbon monoxide
  2. carboxyl acids
  3. methane
  4. ethane

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