Science

Wastewater Story

Question:

Here is a crossword puzzle. Good luck!
ncert-solutions-class-7-science-chapter-18-wastewater-story-01
Across:
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down:
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which cause cholera
7. A chemical to disinfect water

Answer:

ncert-solutions-class-7-science-chapter-18-wastewater-story-02

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Wastewater Story

Q 1.

Describe the steps involved in getting clarified water from wastewater.

Q 2.

Why should oils and fats be not released in the drain? Explain.

Q 3.

Outline your role as an active citizen in relation to sanitation.

Q 4.

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

Q 5.

Fill in the blanks:
(a) Cleaning of water is process of removing __________
(b) Wastewater released by houses is called __________.
(c) Dried __________ is used as manure.
(d) Drains get blocked by __________ and __________.

Q 6.

Why should oils and fats be not released in the drain? Explain.

Q 7.

What is sludge? Explain how it is treated.

Q 8.

Explain the relationship between sanitation and disease.

Q 9.

Explain the Junction of bar screens in a wastewater treatment plant.

Q 10.

Name two chemicals used to disinfect water.

Q 11.

Here is a crossword puzzle. Good luck!
ncert-solutions-class-7-science-chapter-18-wastewater-story-01
Across:
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down:
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which cause cholera
7. A chemical to disinfect water

Q 12.

Untreated human excreta is a health hazard. Explain.