Meaning, Methods and Reasons for Water Purification Basic Science Primary 3 Second Term Lesson Notes Week 6

Lesson Plan: Meaning, Methods, and Reasons for Water Purification

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Lesson Plan Details

Subject: Basic Science
Class: Primary 3
Term: Second Term
Week: Week 6
Age: 8–9 years
Topic: Water
Sub-topic: Meaning, Methods, and Reasons for Water Purification
Duration: 40 minutes

Behavioral Objectives

By the end of the lesson, pupils should be able to:

1. Define water purification.
2. List different methods of purifying water.
3. Explain why water purification is important.

Keywords

• Water purification
• Methods
• Clean water
• Contaminants
• Health

Set Induction

The teacher displays two glasses of water: one clean and one visibly dirty. The teacher asks, “How do we make dirty water clean enough to drink?”

Entry Behaviour

Pupils have basic knowledge about clean and contaminated water from the previous lesson.

Learning Resources and Materials

• Pictures or samples of water purification methods (boiling, filtration, etc.)
• Two glasses of water (one clean, one dirty)
• Filtration setup (if possible)

Building Background/Connection to Prior Knowledge

The teacher reminds pupils about the qualities of clean water and discusses the risks of drinking contaminated water.

Embedded Core Skills

• Critical thinking
• Health awareness
• Problem-solving

Learning Materials

1. Lagos State Scheme of Work for Basic Science (Primary 3).
2. “Science Around Us” textbook for Primary 3.

Instructional Materials

• Charts illustrating water purification methods
• A simple filtration setup
• Boiling setup (pictures or videos)

Content

What is Water Purification?

• Water purification is the process of making water clean and safe for drinking.
• It removes dirt, germs, and harmful substances from water.

Methods of Water Purification

1. Boiling: Heating water until it boils to kill germs.
2. Filtration: Passing water through a filter to remove dirt and particles.
3. Sedimentation: Allowing dirt to settle at the bottom before using the clear water.
4. Chemical Treatment: Adding chemicals like chlorine to kill germs.
5. Distillation: Heating water to form steam and collecting the clean water when it cools.

Reasons for Water Purification

1. To Make Water Safe for Drinking: It removes germs and harmful substances.
2. To Prevent Diseases: Protects against cholera, typhoid, and diarrhea.
3. To Improve Taste and Smell: Clean water tastes and smells better.
4. To Remove Harmful Chemicals: Purification eliminates dangerous chemicals.
5. To Protect the Environment: Reduces water pollution.

Evaluation Questions (Fill-in-the-Blank)

1. Water purification makes water ______ to drink. (a) clean (b) dirty (c) unsafe (d) harmful)
2. ______ is the process of making water clean. (a) Filtration (b) Purification (c) Boiling (d) Sedimentation)
3. Boiling water kills ______. (a) dirt (b) germs (c) chemicals (d) air)
4. ______ removes dirt by passing water through a filter. (a) Boiling (b) Sedimentation (c) Filtration (d) Distillation)
5. Adding ______ to water kills germs. (a) sand (b) chlorine (c) sugar (d) oil)
6. Dirty water can cause ______ diseases. (a) air (b) fire (c) waterborne (d) food)
7. Sedimentation allows ______ to settle at the bottom of water. (a) germs (b) dirt (c) chemicals (d) oil)
8. Water purification improves the ______ of water. (a) taste (b) dirt (c) germs (d) oil)
9. Clean water is important for ______ health. (a) poor (b) good (c) bad (d) weak)
10. Distillation collects ______ water. (a) dirty (b) contaminated (c) clean (d) harmful)

Class Activity Discussion (FAQs)

1. What is water purification?
   It is the process of making water clean and safe.
2. Why is water purification important?
   It prevents diseases and makes water safe to drink.
3. Name one method of purifying water.
   Boiling.
4. How does boiling water help?
   It kills germs.
5. What does filtration do?
   It removes dirt from water.
6. What is sedimentation?
   Allowing dirt to settle at the bottom of water.
7. Can chemicals purify water?
   Yes, chemicals like chlorine kill germs.
8. Why does water need to be clean?
   To prevent sickness.
9. What happens if we drink dirty water?
   We can get diseases like cholera.
10. What does distillation do?
    It collects clean water from steam.

Presentation Steps

Teacher’s Activities

1. Revise the previous lesson on clean water and contaminants.
2. Show pictures or examples of dirty water and explain the need for purification.
3. Define water purification and list its methods.
4. Demonstrate a simple filtration process (if possible).
5. Explain the reasons for purifying water with examples.
6. Ask pupils to share how they purify water at home.

Learners’ Activities

1. Observe the teacher’s demonstration.
2. Identify methods of water purification from pictures or charts.
3. Discuss why it is important to purify water.
4. Answer questions during the lesson.

Assessment

Short-Answer Questions:

1. What is water purification?
2. Name three methods of purifying water.
3. Why is boiling water important?
4. What is filtration?
5. List two reasons for purifying water.
6. Name one disease caused by drinking dirty water.
7. How does sedimentation work?
8. Why do we use chlorine in water?
9. What happens if we drink contaminated water?
10. What is the purpose of distillation?

Conclusion

The teacher revises the key points of the lesson, answers questions, and provides feedback to ensure pupils understand the importance of water purification and how it protects their health.