Match the following 1. Sewage a Chlorination 2 Open drains b Removes bigger floating wastes 3 Vegetable peels c Breeding ground of mosquitoes 4 Bar screen d Organic wastes 5 Disinfection e Dirty water from homes and industries

1 . Sewage or domestic/municipal wastewater, is a type of wastewater that is produced by a community of people. 2 . Open drains are very dangerous and harmful as it is a breeding place for all the disease-causing organisms, flies, mosquitoes, etc. 3 . Vegetable peels are organic wastes which are rich source of organic nutrients, used as biofertilizer. 4 . A bar screen is a mechanical filter used to remove large objects, such as rags and plastics from wastewater. 5 . Disinfection is carried out to destroy the microbiological agents that cause disease by using chemical process called chlorination. Following match the column has the correct pairs. 1. Sewage e. Dirty water from homes and industries. 2. Open drains c. Breeding ground of mosquitoes. 3. Vegetable peels d. Organic wastes. 4. Bar screen b. Removes bigger floating wastes. 5. Disinfection a. Chlorination.

E M B I B E

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 9

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7th CBSE

IMPORTANT

Earn 100

Which of the following is a biodegradable waste?

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Important Questions on Wastewater Story

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 10

Chlorination is done during?

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 1

Plants can survive on impure water.

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 2

After the primary treatment, water is still impure.

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 3

Solid impurities need not to be removed from water before releasing it into water bodies.

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 4

We should dump plastic bags into water bodies.

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Q 5

Cooking oil and ghee from the kitchen should not be thrown in the drain.

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7th CBSE

IMPORTANT

Interactive Science 7>Chapter 18 - Wastewater Story>SUMMATIVE ASSESSMENT>Match the following

Match the following

1.	Sewage	a	Chlorination
2	Open drains	b	Removes bigger floating wastes
3	Vegetable peels	c	Breeding ground of mosquitoes
4	Bar screen	d	Organic wastes
5	Disinfection	e	Dirty water from homes and industries