Lesson Notes By Weeks and Term - Primary 2

Harmful substances

Week: Eight

Subject: Social Studies

Term: 1st Term

Class: Primary 2

Topic: Harmful substances

Previous knowledge: Students are familiar with some examples of harmful substances�

Behavioural objectives: At the end of the lesson, pupils should be able to

  1. Explain the meaning of harmful substances.
  2. State types of harmful substances.
  3. Give examples of harmful substances.
  4. State places where the drugs or substances can be discovered.

Instructional material: pictures, chart and real objects of harmful substances in their environment.

Reference material: Learn Africa Basic Social Studies with Security Education for primary schools by B.J Obebe and others


Harmful substances

Harmful substances are food, water, fruits, and drugs that are unfit for us to take into our body. We can get ill if we eat dirty food or drink dirty water. We can also get ill if we buy and take bad or expired drugs. Harmful substances can be found in the school, home, church, mosque, market etc.

Examples of harmful substances

The substances that are harmful to our bodies include:

  1. Rotten food
  2. Expired tinned foods or drugs
  3. Unripe fruits
  1. Impure (dirty) water
  2. Poorly cooked food
  3. Infested foods: Foods that have been exposed to dirt and germs.
  4. Too much alcohol
  5. Cigarette

Dangers of harmful substances to the body

The following are the different dangers harmful substance can bring to our bodies.

  1. Drinking dirty water causes sickness to the body.
  2. Taking harmful substances affect the way we grow.
  3. Eating unripe fruit causes stomachache.
  4. Taking expired drugs can lead to another illness or even death.
  5. Smoking cigarette may cause lung diseases.
  6. A driver that takes excess alcohol may have accident


Step I: Teacher revises the previous topic

Step II: Teacher inroduces the new topic "Harmful substances"

Step III: Teacher mentions examples of harmful substances

Step IV: Teacher lists and explains the danger of harmful substances.

Step V: Pupils contribute and ask questions


  1. If we eat dirty food, we can get ______________. A well B ill C fat
  2. One example of harmful substances is ______________ A pure water B clean water C impure water
  3. Eating unripe fruit causes ______________. A headache B malaria C stomachache
  4. We must avoid ______________. A alcohol and cigarette B well-cooked food C water

Conclusion: Teacher concludes the lesson by summarising the topic.


  1. What are harmful substances?
  2. List three examples of harmful substances
  3. Mention three places they can be found.
  4. Write two dangers of taking harmful substances.

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