CLASS 7 Chapter 18 Wastewater Story

Class 7 Biology / Neeti Rathore

Short answer type questions Question1. What do you mean by sewage treatment? Question 2. What is sewage? Question 3. Why chlorine is used to clean water? Question 4. What is sewerage? Question 5. Why cleaning water is important? Question 6. What are the by-products of wastewater treatment? Question 7. What are aerobic and anaerobic […]

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CLASS 7 Chapter 18 Wastewater Story

Class 7 Biology / Neeti Rathore

Question 1. 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 ____________. Solution 1. (a) Cleaning of water is a process of removing pollutants. (b) Wastewater released by houses

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