IGCSE O Level Biology Online Tests
Decomposers in Nature MCQ (Multiple Choice Questions) PDF Download
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Decomposers in Nature MCQs: Questions and Answers PDF Download
After decomposition of household sewage, the dried substance results in
- sludge
- fertilizer
- land fill
- all of above
Before discharging decomposed sewage into rivers and seas, the
- water is filtered only
- pathogens are removed only
- pH of sewage is neutralized
- water is filtered and pathogens are removed
Inorganic gases released during decomposition includes
- carbon dioxide
- hydrogen sulphide
- water vapors
- all of above
Inorganic salts released during decomposition include
- nitrate
- sulfate
- phosphate
- all of above
Biogas includes none ,but
- carbon monoxide
- carboxyl acids
- methane
- ethane
IGCSE O Level Biology Practice Tests
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