UBSE - 7 - Science :: Wastewater Story

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Course content
Textbook
Teaching learning resources

Course Content / Subtopic list:

Wastewater
Sewage water and their types
Sanitation
Diseases caused by water
Aerobic bacteria and Anaerobic bacteria

Expected Learning Outcome:

SWBAT-

Explain the sewage of water and their types
Classify between aerobic bacteria and anaerobic bacteria

English Medium

English medium textbook

Hindi Medium

Hindi medium textbook

Lesson Plan

Dear Volunteer Teacher,

The lesson plan provides an overall picture of what you need to teach. It is recommended that you follow the objectives and the learning outcomes stated in the lesson plan.

We suggest that that you read the chapter thoroughly and research on how to teach the topic effectively to meet the learning outcomes.

Kindly note, while the lesson plan is a guide to teach, you can also add your own teaching elements to enhance the learning process of the children.

[Edition 2022]

Wastewater Story Lesson Plan - (Lesson Plan - English)

[Edition 2019]

https://drive.google.com/open?id=1RSi6ZMrAEEMOkBHUfcZ4cfKHqVCUok84 (Lesson Plan - English)

https://drive.google.com/open?id=1K4AdrEsz1N_uAgbyu4aW1c6_B8XblqAY (PPT - English)

You may use the content as it is or download and modify them to suit the students requirements.

If you feel any major modifications or additions are carried out by you in the form of adding any new activity, presentations, videos etc. we request you to send the modified version to submitcontent@evidyloka.org for enabling upload of the modified version.

The worksheets of the lesson can be accessed from the worksheet tab.

Videos

[Author - Kripa S]

https://www.youtube.com/watch?v=93BqLewm3bA&t=40s (water pollution -English)

Images

[Author - Kripa S]

http://d2ouvy59p0dg6k.cloudfront.net/img/wasting_water_large_350396.jpg (wastage of water example 1)

https://im.rediff.com/getahead/2005/apr/04water.jpg (wastage of water example 2)

Activities

[Author - Kripa S]

1.Divide yourself into groups to perform the activity.

a) Fill a large glass jar 3/4 full of water. Add some dirty organic matter such as grass pieces or orange peels, a small amount of detergent, and a few drops of an ink or any colour.

b) Cap the jar, shake it well and let the mixture stand in the sun for two days.

c) After two days, shake the mixture. How does it smell?

d) Use a filter paper/ Cotton cloth to filter this mixture. What remains? What is the colour?

[Contributor - Suhas B]

Lesson Plan version 1.1 activities

Divide yourself into groups to perform the activity. Record observations at each stage:

1. Fill a large glass jar 3/4 full of water. Add some dirty organic matter such as grass pieces or orange peels, a small amount of detergent, and a few drops of an ink or any colour

2. Cap the jar, shake it well and let the mixture stand in the sun for two days.

3. After two days, shake the mixture and pour a small sample into test tube. Label this test tube “Before treatment; Sample 1 How does it smell?

4. Use an aerator from an aquarium to bubble air through the sample in the glass jar. Allow several hours for aeration; leave the aerator attached overnight. If you do not have an aerator, use a mechanical stirrer or a mixer. You may have to stir it several times.

5. The next day when aeration is complete, pour another sample into a second test tube. Label it as “After aeration; Sample 2” aeration; Sample 2”

6. Fold a piece of filter paper to form a cone. Wet the paper with tap water and then insert the cone in a funnel. Mount the funnel on a support (as you have learnt in Class VI).

7. Place layers of sand, fine gravel and finally medium gravel in the funnel (Fig. 18.2). (An actual filtration plant does not use filter paper, but the sand filter is several meters deep).

8. Pour the remaining aerated liquid through the filter into the beakers. Do not allow the liquid to spill over the filter. If the filtered liquid is not clear, filter it a few times till you get clear water.

9. Pour a sample of the filtered water into a third test tube labelled “Filtered; Sample 3”.

10. Pour another sample of the filtered water into a fourth test tube. Add a small piece of a chlorine tablet. Mix well until the water is clear. Label the test tube “Chlorinated; Sample 4”.

11. Observe carefully the samples in all the test tube and smell them