Class: Junior Secondary School 3 (JSS3, JSS 3)
Term: 2nd Term
Week: 10
Age: 14 years
Duration: 45 minutes
Subject: Pre Vocational Studies
Curriculum Theme: Home Economics
Previous Lesson: Food Hygiene and Safe Food Handling
Topic: Food Hygiene And Safety (part 2)
Subject Matter: Sources of food contamination and poisoning, Sensory signs of spoilage and causative micro-organisms.

SPECIFIC OBJECTIVES

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

Cognitive Domain:
(a) Define food contamination, food poisoning, and food spoilage.
(b) Identify common sources of food contamination and the micro-organisms responsible.
(c) Describe sensory signs that indicate food spoilage.

Affective Domain:
(a) Appreciate the importance of practicing good food hygiene.
(b) Show responsibility in handling food safely to prevent illness.

Psychomotor Domain:
(a) Demonstrate safe handling, storage, and inspection of food items.
(b) Identify contaminated or spoiled food through visual, smell, and taste cues.

Social Domain:
(a) Promote hygienic food practices at home and in school.
(b) Encourage peers and family members to maintain food safety standards.

REFERENCE MATERIALS

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
Lagos State Unified Scheme of Work for Junior Secondary Schools
Healthline – Common Causes of Food Poisoning https://www.healthline.com/health/food-poisoning
Relevant Textbooks

INSTRUCTIONAL MATERIALS

The teacher will teach this lesson with the aid of:

Charts showing sources of contamination
Samples of fresh and spoiled food
Micro-organism illustration charts
Whiteboard and markers
Projector or images of food spoilage
Handouts on food hygiene tips

RATIONALE FOR THE LESSON

This lesson equips pupils with knowledge of food safety, enabling them to prevent food-borne illnesses and maintain good health.

PREREQUISITE/PREVIOUS KNOWLEDGE

Pupils are expected to have basic knowledge of general hygiene practices and the importance of cleanliness in the kitchen from previous lessons.

LESSON CONTENT/BOARD SUMMARY

FOOD HYGIENE AND SAFETY

Sources of Food Contamination and Poisoning

Food contamination occurs when food becomes unsafe to eat due to the presence of harmful substances or micro-organisms. Food poisoning is an illness caused by consuming contaminated food.

The following are common sources of food contamination:

Biological sources – bacteria, viruses, fungi, and parasites
Physical sources – hair, glass, metal fragments, dust
Chemical sources – cleaning agents, pesticides, food additives
Cross-contamination – transfer of pathogens from one food to another

Sensory Signs of Food Spoilage

Spoilage refers to changes in food that make it unfit for consumption, often caused by micro-organisms. Sensory evaluation can help detect spoiled food before consumption.

These include:

Changes in color – darkening or discoloration
Unpleasant odor – sour, rancid, or rotten smell
Texture changes – slimy, sticky, or mushy surface
Taste changes – sour, bitter, or unusual flavor
Presence of mold or visible fungi

Causative Micro-organisms

Micro-organisms are the main agents of food spoilage and poisoning.

Examples are:

Bacteria – Salmonella, E. coli, Staphylococcus aureus
Fungi – Aspergillus, Penicillium
Viruses – Norovirus
Parasites – Giardia, Trichinella

TEACHING METHODS/INSTRUCTIONAL TECHNIQUES

Discussion, Lecture, Explanation, Visual Aids, Group Work, Storytelling, Demonstration

INSTRUCTIONAL PROCEDURES

To deliver this lesson, the teacher will adopt the following steps:

Step 1: Introduction (Teaching Skill: Set Induction)

Time: 5 minutes
Teacher’s Activity: Introduce the topic by asking pupils about their experience with spoiled food and previous knowledge of food hygiene.
Pupils’ Activity: Respond to questions and share experiences.
Learning Point: Pupils recall prior knowledge and become interested in the lesson.

Step 2: Sources of Food Contamination

Time: 10 minutes
Teaching Skill: Explanation and Visual Aid
Teacher’s Activity: Define food contamination and show charts illustrating biological, physical, and chemical sources.
Pupils’ Activity: Observe charts and take notes.
Learning Point: Pupils identify different sources of food contamination.

Step 3: Sensory Signs of Food Spoilage

Time: 10 minutes
Teaching Skill: Demonstration and Explanation
Teacher’s Activity: Present samples of fresh and spoiled food and discuss changes in color, odor, texture, and taste.
Pupils’ Activity: Observe samples, smell, and note sensory differences.
Learning Point: Pupils recognize signs of food spoilage.

Step 4: Causative Micro-organisms

Time: 10 minutes
Teaching Skill: Explanation and Discussion
Teacher’s Activity: Explain micro-organisms responsible for contamination and food poisoning with examples.
Pupils’ Activity: Take notes and ask questions for clarification.
Learning Point: Pupils understand the agents that cause food spoilage and illness.

Step 5: Note-Taking

Time: 5 minutes
Teaching Skill: Independent Work
Teacher’s Activity: Guide pupils to summarize the lesson points in their notebooks.
Pupils’ Activity: Write down key points from the lesson content.
Learning Point: Reinforcement of knowledge.

Step 6: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define food contamination and food poisoning
List three sources of food contamination
Mention three sensory signs of food spoilage
Give two examples of micro-organisms causing food poisoning
Pupils’ Activity: Answer questions orally or in writing
Learning Point: Assess understanding and retention of lesson

Step 7: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: Recap key points and reinforce importance of food hygiene
Pupils’ Activity: Listen and ask final questions
Learning Point: Consolidate learning and link to daily practices

LESSON KEYWORDS

Food contamination – presence of harmful substances in food
Food poisoning – illness from consuming contaminated food
Spoilage – changes in food making it unsafe
Micro-organisms – tiny living agents causing spoilage
Cross-contamination – transfer of pathogens between foods

DIFFERENTIATION

Use visual aids for visual learners, demonstrations for kinesthetic learners, and clear explanations for auditory learners. Encourage group discussions for peer learning.

NOTE FOR TEACHERS USING THIS LESSON PLAN

Ensure food samples are safe to handle. Encourage hygiene practices such as washing hands before handling food. Reinforce safety in school canteens and homes.