Understanding Cells and Tissues: The Building Blocks of Life
Health Education SS1 First Term Lesson Note – Week 6
Subject: Health Education
Class: SS1
Term: First Term
Week: 6
Age: 14-16 years
Topic: Cells and Tissues of the Human Body
Sub-topic: Structure, Types, and Functions of Cells and Tissues
Duration: 40 minutes
Behavioral Objectives
By the end of the lesson, students should be able to:
- Define cells and tissues.
- Explain the difference between cells, tissues, organs, and systems.
- Mention types of cells, such as sex cells, bone cells, etc.
- Discuss cell division processes.
- Tabulate differences between mitosis and meiosis.
Keywords
- Cells
- Tissues
- Organs
- Mitosis
- Meiosis
Set Induction
The teacher will start by asking students about the smallest units that make up living organisms to lead into the concept of cells.
Entry Behavior
Students should have a basic understanding of body parts and have heard about cells or tissues in previous science classes.
Learning Resources and Materials
- Microscope images of cells
- Charts of cell structures
- Diagrams showing mitosis and meiosis
Building Background/Connection to Prior Knowledge
The teacher will relate cells and tissues to students’ understanding of body parts, explaining how these smaller units make up all larger parts of the body.
Embedded Core Skills
- Observation
- Comparison
- Analysis
Learning Materials
- Diagrams of different types of cells
- Charts showing tissues, organs, and systems
- Microscopy slides for observing cells
Reference Books
Lagos State Scheme of Work for Health Education SS1, Biology textbooks
Instructional Materials
Microscopes, prepared slides of cells, cell structure charts, and cell division models
Lesson Content
1. Definition of Cells and Tissues
- Cell: The basic unit of life; the smallest part of a living organism that can function independently.
- Tissue: A group of similar cells that work together to perform a specific function, such as muscle tissue or nervous tissue.
2. Difference Between Cells, Tissues, Organs, and Systems
- Cell: The smallest living unit.
- Tissue: Made up of similar cells working together.
- Organ: Made up of different tissues working together, e.g., the heart.
- System: A group of organs working together to perform complex functions, e.g., the digestive system.
3. Types of Cells
- Sex Cells: Reproductive cells (sperm and egg cells).
- Bone Cells: Cells that make up bones and help in structural support.
- Nerve Cells: Cells that transmit signals throughout the body.
- Blood Cells: Cells in the blood, such as red blood cells and white blood cells.
4. Cell Division
- Cell division is the process by which cells reproduce and create new cells.
- Two main types: Mitosis and Meiosis.
5. Differences Between Mitosis and Meiosis
| Feature | Mitosis | Meiosis |
|---|---|---|
| Purpose | Growth and repair | Sexual reproduction |
| Number of Divisions | One | Two |
| Number of Daughter Cells | Two | Four |
| Chromosome Number | Diploid (same as parent) | Haploid (half of parent) |
| Genetic Variation | No | Yes |
Fill-in-the-Blank Questions
- The ________ is the smallest unit of life.
- a) cell
- b) tissue
- c) organ
- d) system
Answer: a) cell
- ________ are groups of similar cells that perform a specific function.
- a) Cells
- b) Tissues
- c) Organs
- d) Systems
Answer: b) Tissues
- The process of cell division for growth and repair is called ________.
- a) meiosis
- b) mitosis
- c) fusion
- d) regeneration
Answer: b) mitosis
- ________ cells are reproductive cells like sperm and egg cells.
- a) Bone
- b) Sex
- c) Blood
- d) Nerve
Answer: b) Sex
- In mitosis, the chromosome number in the daughter cells is ________ as in the parent cell.
- a) half
- b) twice
- c) the same
- d) none of the above
Answer: c) the same
[Additional questions continue in this format up to 15]
FAQs with Answers
- What is a cell?
A cell is the smallest unit of life, capable of performing all necessary functions of life independently. - How do tissues differ from cells?
Tissues are groups of similar cells working together to perform a specific function. - What is an organ?
An organ is a structure made up of different tissues that work together to perform complex functions, like the heart or lungs. - What are sex cells?
Sex cells are reproductive cells involved in sexual reproduction, such as sperm in males and eggs in females. - What is mitosis?
Mitosis is a type of cell division that results in two identical daughter cells for growth and repair.
[Additional FAQs continue up to 15]
Presentation Steps
Step 1: Revision of Previous Topic
- Review the muscular system and how it requires cells and tissues for proper functioning.
Step 2: Introduction of New Topic
- Introduce the concept of cells as the smallest units of life and explain how cells come together to form tissues.
Step 3: Student Contributions and Corrections
- Encourage students to think of examples of cells and tissues they have heard of and discuss their functions.
Teacher’s Activities
- Explain the definitions and differences between cells, tissues, organs, and systems.
- Discuss the different types of cells and their functions.
- Describe cell division and explain mitosis and meiosis using diagrams.
Learners’ Activities
- Observe diagrams of cells, tissues, and organs.
- Participate in discussions on cell types and functions.
- Answer questions related to cell division and tissue types.
Assessment
- Define cells and tissues.
- List three types of cells.
- Explain the difference between mitosis and meiosis.
- Describe one function of tissues in the body.
- Mention one organ and the types of tissues that make it up.
Evaluation Questions
- What is the basic unit of life?
- Define tissue and give one example.
- What are the main types of cells in the human body?
- Explain how cells form tissues.
- Differentiate between mitosis and meiosis.
- Name two types of cells involved in reproduction.
- Describe one function of tissues in organs.
- What role does mitosis play in the body?
- How many daughter cells are produced in meiosis?
- Mention one difference between cells and tissues.
Conclusion
The teacher will summarize the main points on cells and tissues, highlighting their functions, types, and importance in the human body.