Class 7 Science worksheet on waste water management with questions and activities.

Let's solve the "Waste Water Story" Class 7 Science Worksheet step by step and explain each answer.

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Q.1 Fill in the blanks:

1. The impurities like lather, oil, urea, dirt etc. which are dissolved and suspended in sewage are called _________.
✔ Answer: Sewage
🔍 *Explanation:* Sewage is the wastewater that contains various impurities such as soap (lather), oils, human waste (urea), dirt, and other organic matter.

2. The set of pipes which take away sewage from our homes to the water treatment plants are called _________.
✔ Answer: Sewer lines or Sewerage system
🔍 *Explanation:* These are underground pipes designed to carry wastewater from homes, industries, and public places to a wastewater treatment plant.

3. _________ is wastewater released by homes, industries, hospitals etc.
✔ Answer: Sewage
🔍 *Explanation:* Sewage refers to all the wastewater generated from domestic, industrial, and institutional sources.

4. _________ trees are planted all along sewage ponds.
✔ Answer: Neem
🔍 *Explanation:* Neem trees are often planted around sewage ponds because they help reduce pollution, provide shade, and their roots absorb harmful substances. They also prevent soil erosion.

5. Wastewater is treated in a _________ treatment plant.
✔ Answer: Sewage
🔍 *Explanation:* Wastewater is treated in a sewage treatment plant where physical, chemical, and biological processes remove contaminants before releasing clean water into the environment.

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Q.2 Complete the chart: Water can be used as

We have a central circle labeled "Clean Water put to Use", with arrows pointing to:
- One box below it: Drinking
- Three other boxes around it (to be filled)

✔ The diagram shows that clean water after treatment can be used for multiple purposes.

So, fill the three empty ovals with appropriate uses:

1. Cooking
2. Bathing / Washing clothes
3. Irrigation / Gardening
*(Other valid answers: Cleaning, washing vehicles, flushing toilets, etc.)*

🎯 Final Chart:
```
[Cooking]
|
[Clean Water put to Use] → [Drinking]
|
[Bathing/Washing]
|
[Irrigation/Gardening]
```

> 💡 *Note:* Any three common uses of clean water are acceptable. These are typical household and agricultural uses.

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Q.3 Identify the following statements as "Do's and Don'ts" for better housekeeping practice:

Let’s analyze each statement:

1. Cooking oil and fats are thrown down the drain.
✘ Don’t
🔍 *Reason:* Oil and fats solidify in pipes and cause blockages. They should be disposed of in trash, not 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.
✔ Do
🔍 *Reason:* This is a good practice — avoiding harmful chemicals in drains protects the sewage treatment process and prevents environmental pollution.

3. Used tea leaves, solid food remains, soft toys, cotton, sanitary towels etc. should be thrown in the drains.
✘ Don’t
🔍 *Reason:* These items can clog pipes and interfere with sewage flow. They should be disposed of in bins.

4. The untreated human excreta is a health hazard, thus toilets should be constructed to maintain personal hygiene.
✔ Do
🔍 *Reason:* Proper toilets prevent open defecation and spread of diseases. This is a necessary hygiene practice.

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✔ Final Answers Summary:

#### Q.1 Fill in the blanks:
1. Sewage
2. Sewer lines (or Sewerage system)
3. Sewage
4. Neem
5. Sewage

#### Q.2 Complete the chart:
- Uses of clean water:
- Cooking
- Bathing / Washing clothes
- Irrigation / Gardening *(any three suitable uses)*

#### Q.3 Do's and Don'ts:
1. Don’t
2. Do
3. Don’t
4. Do

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