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Decomposers in Nature MCQ with Answers PDF Download

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Biology: Decomposers in Nature MCQs PDF Download

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

A) sludge
B) fertilizer
C) land fill
D) all of above

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

A) water is filtered only
B) pathogens are removed only
C) pH of sewage is neutralized
D) water is filtered and pathogens are removed

MCQ: Inorganic gases released during decomposition includes

A) carbon dioxide
B) hydrogen sulphide
C) water vapors
D) all of above

MCQ: Inorganic salts released during decomposition include

A) nitrate
B) sulfate
C) phosphate
D) all of above

MCQ: Biogas includes none ,but

A) carbon monoxide
B) carboxyl acids
C) methane
D) ethane

Practice Tests: O Level Biology Exam Prep

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