Safety Measures in Applying Chemicals for Basic Four

Lesson Plan for Basic Four Agricultural Science: Safety Measures in Applying Chemicals

Subject: Agricultural Science

Class: Basic Four

Term: Second Term

Week: 5

Age: 9 – 10 years

Topic: Safety Measures in Applying Chemicals

Sub-topic: Dangers of Excessive Chemical Use

Duration: 40 minutes

Behavioral Objectives:

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

1. List two safety measures for applying chemicals.
2. Explain two dangers of excessive use of chemicals.
3. Describe how to prevent harmful effects of chemicals.

Keywords:

• Chemicals
• Safety
• Knapsack sprayer
• Pollution
• Toxic

Set Induction:

The teacher asks the pupils to mention some chemicals used in farming (e.g., fertilizers, pesticides) and how they think farmers protect themselves while using them.

Entry Behavior:

Pupils already know about materials for growing crops, including fertilizers and pest-killing chemicals.

Learning Resources and Materials:

• Whiteboard/Chalkboard
• Explanatory posters/pictures of farmers using safety equipment
• Knapsack sprayer (model or picture)
• Soap and water for demonstration

Building Background/Connection to Prior Knowledge:

The teacher revises the topic “Materials for Growing Crops” and asks pupils to recall the importance of fertilizers and pest-killing chemicals.

Embedded Core Skills:

• Critical Thinking
• Observation Skills
• Environmental Awareness

Learning Materials:

• Lagos State Scheme of Work
• Online agricultural resources
• Agricultural Science textbooks

Instructional Materials:

1. Whiteboard and markers
2. Knapsack sprayer or image of one
3. Posters showing proper chemical usage

Content

Safety Measures in Applying Chemicals:

1. Cover Your Face and Mouth:
   Always use a mask or cover your mouth and face while spraying chemicals to avoid inhalation.
2. Avoid Skin Contact:
   Wear gloves and protective clothing to prevent chemicals from touching your skin.
3. Wash Hands After Use:
   Wash your hands with soap and water or take a full bath after applying chemicals.
4. Keep Chemicals Away from Food:
   Do not store chemicals near food items or water sources to prevent contamination.
5. Follow Instructions:
   Always read and follow the instructions on the chemical packaging before use.

Dangers of Excessive Use of Chemicals:

1. Crop Damage:
   Excessive chemicals can burn or kill crops.
2. Soil Pollution:
   Too many chemicals can destroy useful organisms in the soil.
3. Water Pollution:
   Chemicals can wash into rivers and streams, killing fish and other water organisms.
4. Air Pollution:
   Spraying chemicals carelessly can release harmful gases into the air.
5. Health Risks:
   Some chemicals can burn the skin or cause respiratory problems when inhaled.

Examples of Safety Measures in Action:

1. A farmer wearing gloves and a face mask while spraying pesticides.
2. A farmer washing hands after using fertilizers.
3. Chemicals stored away from food in labeled containers.
4. A farmer reading instructions on chemical packaging before use.
5. Farmers using scarecrows to reduce reliance on chemicals.

Presentation Steps:

Step 1: The teacher revises the previous topic, “Materials for Growing Crops.”

Step 2: The teacher introduces the new topic by showing a picture of a farmer using safety equipment and explains its importance.

Step 3: The teacher allows pupils to share their ideas about how farmers protect themselves when using chemicals.

Teacher’s Activities:

• Explain safety measures and demonstrate with a knapsack sprayer.
• Discuss the dangers of excessive chemical use.
• Use explanatory posters to show examples.

Learners’ Activities:

• Answer questions about safety measures.
• Identify dangers of improper chemical use.
• Participate in a demonstration of proper safety practices.

Evaluation Questions:

Fill-in-the-Blank Questions:

1. Chemicals should be sprayed with the aid of a ______. (a) knapsack sprayer (b) broom (c) stick (d) knife
2. Wash your ______ after using chemicals. (a) feet (b) hands (c) head (d) face
3. Excessive use of chemicals can kill ______. (a) crops (b) teachers (c) buildings (d) clouds
4. Always ______ instructions before applying chemicals. (a) ignore (b) write (c) read (d) eat
5. Chemicals can cause ______ pollution. (a) soil (b) air (c) water (d) all of the above
6. A farmer should wear ______ to protect their hands. (a) gloves (b) hats (c) shoes (d) belts
7. Toxic chemicals can harm ______ in rivers. (a) fish (b) sand (c) trees (d) air
8. Chemicals can burn the ______. (a) clothes (b) skin (c) house (d) bucket
9. A scarecrow is used to scare away ______. (a) birds (b) fish (c) snakes (d) insects
10. Farmers should ______ chemicals properly. (a) store (b) drink (c) throw (d) ignore

FAQs for Class Discussion:

1. What are two safety measures for applying chemicals?
   Answer: Cover your mouth and wash your hands after use.
2. Why should we wash hands after using chemicals?
   Answer: To remove harmful residues.
3. Can excessive chemicals kill crops?
   Answer: Yes, they can.
4. Name one way chemicals pollute the environment.
   Answer: Chemicals can pollute water and air.
5. What happens if chemicals touch the skin?
   Answer: They can cause burns.

Conclusion:

The teacher summarizes the topic and highlights key points about safety in chemical use. The teacher marks pupils’ notes and provides feedback.

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