Digestive System: Digestion, Digestive Organs and Importance of Food Digestion to Human Health Primary 4 (Basic 4) Third Term Week 9 Basic Science and Technology

DIGESTIVE SYSTEM: DIGESTION, DIGESTION OF FOOD, DIGESTIVE ORGANS, HOW FOOD DIGESTION IS IMPORTANCE TO HEALTHY HUMAN PRIMARY 4 (BASIC 4) THIRD TERM WEEK 9 BASIC SCIENCE AND TECHNOLOGY

BASIC SCIENCE AND TECHNOLOGY

THIRD TERM

WEEK 9 

PRIMARY 4 (BASIC 4) 

THEME – UNDERSTANDING OUR SYSTEM 

PREVIOUS LESSON – Harmful Food: Meaning, Examples and Effects of Unbalanced Diet Primary 4 (Basic 4) Third Term Week 8 Basic Science and Technology

TOPIC – DIGESTIVE SYSTEM 

LEARNING AREA

1. Introduction

2. Meaning of Digestion and Food Digestion

3. Process of Food Digestion

4. Digestive Organs and Importance of Food Digestion to Human Health

5. Weekly Assessment: Test Questions and Answers/Assignment

6. Summary

LEARNING OBJECTIVES 

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

1. Explain the meaning of digestion.

2. Describe the process of digestion of food.

3. Identify the main digestive organs.

5. State the functions of digestive organs.

6. Explain the importance of digestion to healthy living.

ENTRY BEHAVIOUR

Pupils have previously learned about food, classes of food, balanced diet, harmful food, and good feeding habits.

This lesson builds on that knowledge by helping pupils understand that after eating food, the body must digest and absorb the nutrients before they can be used for growth, energy, and good health. Pupils will also learn about the organs responsible for digestion.

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

1. Chart of the digestive system

2. Diagram of digestive organs

3. Pictures of digestive organs

4. Textbooks and charts

METHOD OF TEACHING

Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons. 

REFERENCE MATERIALS

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

CONTENT OF THE LESSON

INTRODUCTION

Whenever we eat food, the body must break it down into smaller parts before it can be used. This process is called digestion.

LESSON 1 – MEANING OF DIGESTION

Digestion is the process of breaking down food into simple substances that can be absorbed and used by the body.

DIGESTION OF FOOD

The digestion of food begins in the mouth and continues through different organs of the digestive system.

Process of Digestion

1. Food is chewed in the mouth.

2. Food passes through the oesophagus (food pipe).

3. Food enters the stomach where it is mixed and broken down further.

4. Digested food moves to the small intestine where nutrients are absorbed.

5. Undigested food passes to the large intestine.

6. Waste materials leave the body through the anus.

LESSON 2 – DIGESTIVE ORGANS

Main Digestive Organs

Mouth

⇓

Oesophagus (Food Pipe)

⇓

Stomach

⇓

Small Intestine

⇓

Large Intestine

⇓

Rectum

⇓

Anus

1. MOUTH

The mouth is the opening through which food enters the body.

Functions (Uses):

• It eeceives food into the body.

• It chews food into smaller pieces.

• It mixes food with saliva to aid digestion.

2. OESOPHAGUS (FOOD PIPE)

The oesophagus is a tube that connects the mouth to the stomach.

Functions (Uses):

• It carries food from the mouth to the stomach.

• It helps food move through the digestive system.

3. STOMACH

The stomach is a bag-like organ where food is stored and mixed.

Functions (Uses):

• It stores food for a short time.

• It mixes and breaks down food.

• It begins further digestion of food.

4. SMALL INTESTINE

The small intestine is a long, narrow tube connected to the stomach.

Functions (Uses):

• It completes digestion of food.

• It absorbs nutrients from digested food into the blood.

• It supplies nutrients needed for growth and energy.

5. LARGE INTESTINE

The large intestine is a wider tube connected to the small intestine.

Functions (Uses):

• It absorbs water from undigested food.

• It forms solid waste (faeces).

• It helps maintain water balance in the body.

6. RECTUM

The rectum is the lower part of the large intestine.

Functions (Uses):

• It stores faeces before it is removed from the body.

7. ANUS

The anus is the opening at the end of the digestive system.

Functions (Uses):

• Removes waste materials (faeces) from the body.

LESSON 3 – IMPORTANCE OF DIGESTION TO HEALTHY HUMAN BEINGS

1. It helps the body obtain nutrients from food.

2. It provides energy for daily activities.

3. It supports growth and development.

4. It helps repair worn-out body tissues.

5. It keeps the body healthy and strong.

WEEKLY ASSESSMENT: TEST QUESTIONS AND ANSWERS/ASSIGNMENT

A. Answer the Questions

1. What is digestion?

2. Mention four digestive organs.

3. Which organ receives food into the body?

4. What is the function of the stomach?

5. Why is digestion important?

B. Fill in the Blanks

6. Digestion is the process of ______ food into simpler substances.

7. Food enters the body through the ______.

8. The ______ carries food from the mouth to the stomach.

9. Nutrients are absorbed in the ______ intestine.

10. Waste leaves the body through the ______.

C. True or False

11. The mouth is a digestive organ. ______

12. The stomach helps to break down food. ______

13. The small intestine absorbs nutrients. ______

14. The anus stores food for digestion. ______

15. Digestion helps the body obtain nutrients from food. ______

D. Matching

Match the digestive organ with its function:

16. Mouth → A. Removes waste from the body

17. Oesophagus → B. Carries food to the stomach

18. Stomach → C. Receives and chews food

19. Small Intestine → D. Absorbs nutrients from food

20. Anus → E. Breaks down and mixes food

ANSWER KEYS

1. Digestion is the process of breaking down food into simple substances that the body can use.

2. Mouth, oesophagus, stomach, small intestine, large intestine, rectum, anus (any four).

3. Mouth

4. It stores, mixes, and breaks down food.

5. It helps the body obtain nutrients and energy from food.

6. breaking down

7. mouth

8. oesophagus (food pipe)

9. small

10. anus

11. True

12. True

13. True

14. False

15. True

16. C. Receives and chews food

17. B. Carries food to the stomach

18. E. Breaks down and mixes food

19. D. Absorbs nutrients from food

20. A. Removes waste from the body

SUMMARY

In this lesson, pupils learned that digestion is the process of breaking down food into simple substances that can be absorbed and used by the body.

They also learned the main digestive organs, which are: Mouth, Oesophagus (Food Pipe), Stomach, etc.

Pupils were taught the functions of each digestive organ and the pathway food follows through the digestive system.

Finally, they learned the importance of digestion, which includes: Providing nutrients to the body, Supplying energy for daily activities, etc.

Overall, the lesson helps pupils understand how the digestive system works to keep the body healthy and strong.

PRESENTATION

To deliver the lesson, the teacher adopts the following steps:

1. The teacher displays a chart or diagram of the human digestive system.

Pupils’ Activities: The pupils observe the chart and identify the organs shown.

2. The teacher asks pupils what happens to food after it is eaten.

Pupils’ Activities: The pupils respond based on their ideas and experiences.

3. The teacher introduces the topic: Digestive System and Digestion of Food.

Pupils’ Activities: The pupils repeat the topic.

4. The teacher explains the meaning of digestion as the process of breaking down food into simple substances that the body can use.

Pupils’ Activities: The pupils listen attentively.

5. The teacher explains the process of digestion from the mouth through the digestive tract.

Pupils’ Activities: The pupils follow the explanation and ask questions.

6. The teacher identifies and explains the main digestive organs: mouth, oesophagus, stomach, small intestine, large intestine, rectum, and anus.

Pupils’ Activities: The pupils identify the organs on the chart.

7. The teacher explains the functions of each digestive organ.

Pupils’ Activities: The pupils listen and participate in discussion.

8. The teacher guides pupils to trace the movement of food through the digestive system using the chart.

Pupils’ Activities: The pupils point out the pathway of food.

9. The teacher discusses the importance of digestion in providing nutrients, energy, and good health.

Pupils’ Activities: The pupils mention benefits of digestion.

10. The teacher summarizes the lesson by revising the meaning of digestion, digestive organs, their functions, and the importance of digestion.

Pupils’ Activities: The pupils answer oral questions and participate in the summary.

CONCLUSION

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

NEXT LESSON

The Human Body: The Mouth, Tongue and Lips and Their Uses Primary 4 (Basic 4) Third Term Week 10 Basic Science and Technology

LESSON EVALUATION 

Teacher asks pupils,

1. What is digestion?

2. Mention four digestive organs.

3. Which organ absorbs nutrients from food?

4. What is the function of the stomach?

5. State two importance of digestion.