CBSE Class 7 Science Waste Water Story Assignment

Q.1 Fill in the blanks :

1. The impurities like lather, oil, urea, dirt etc. Which are dissolved and suspended in sewage are called _____________.

2. The set of pipes which take away sewage from our homes to the water treatment plants are called ________________.

3. ___________ is wastewater released by homes, industries, hospitals etc.

4. ___________ trees are planted all along sewage ponds.

5. Wastewater is treated in a ___________ treatment plant

Q.2 Complete the chart :

Q.3 Identify the following statements as “Do’s and Don’ts” for better housekeeping practice :

1. Cooking oil and fats should be thrown down the drain.

2. Chemicals like paints, solvents, insecticides, medicines, motor oil may kill microbes that help to purify water, so do not throw them down the drain.

3. Used tea leaves, solid food remains, soft toys, cotton, sanitary towels etc. should be thrown in the drains.

4. The untreated human excreta is a health hazard, thus toilets should be constructed to maintain personal hygiene. 

5. Cleaning and wiping floors everyday is not necessary at all.

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