Answer in one word:
(i) Domestic waste water.
(ii) Industrial and commercial waste.
(iii) System of sewerage in rural areas.
(iv) These organisms treat sewage in composting pits.

Dear student, 

The answers are as follows:

(a) Sanitary sewage
(b) Industrial waste water  
(c) Rural sewage system 
(d)Organisms like bacteria, fungi, insects and compost worms are present mainly to provide aerobic environment.

Regards.

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domestic -waste genrated in homes .
agricultural -excessive use of chemical fertiliser, insecticides .
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