Question

Fill in the blanks:
(a) Cleaning of water is a process of removing ____________.
(b) Wastewater released by houses is called ____________.
(c) Dried ____________ is used as manure.
(d) Drains get blocked by ____________ and ____________.
NCERT Solutions for Class 7th Science Chapter 18 Wastewater Story Page 228 Exercise Question 1

Answer 1

(a) Cleaning of water is a process of removing  pollutants 
(b) Wastewater released by houses is called  sewage 
(c) Dried   sludge  is used as manure.
(d) Drains get blocked by  cooking oil and  fats ............

hope its help u..

Answer 2

A) undesirable chemical and biological contaminents Or pollutants B) sewage C) sludge D) cooking oil and fats.