Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 1st Term
Week: 3
Age: 15 years
Duration: 45 minutes
Subject: Health Education
Curriculum Theme: Health Education
Previous Lesson: Health Promotion.
Topic: CELLS AND TISSUES OF HUMAN BODY
Subject Matter: definition of cells, definition of tissues, nature of cells and tissues, meaning of growth, meaning of development, differences between growth and development, cell division, stages of cell division

Specific Objectives

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

Cognitive Domain:

Define cells and tissues.
Differentiate between growth and development.
Describe the stages of cell division.

Affective Domain:

Appreciate the importance of cells and tissues in the human body.
Show interest in observing microscopic structures.

Psychomotor Domain:

Properly identify and draw cheek cells under a microscope.
State the main events occurring in each stage of cell division.

Collaborate effectively with peers during practical activities.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Health Education (Senior Secondary)
State Unified Scheme of Work for Health Education (SS 1)
Essential Health Education for Senior Secondary Schools by O. F. Eze and A. A. Okoro

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing cell division
Microscope
Cheek cell slides
Stains (e.g., Methylene blue)
Droppers
Cover slips
Slides

Rationale for the Lesson

This lesson helps pupils understand the basic building blocks of the human body and how they multiply. Understanding cells and tissues is important for comprehending human anatomy, physiology, and various health conditions.

Prerequisite/Previous Knowledge

Pupils are expected to have basic knowledge of living things and their characteristics from their previous studies in Basic Science.

Lesson Content/Board Summary

CELLS AND TISSUES OF HUMAN BODY

Definition of Cell

A cell is the basic structural and functional unit of all known living organisms. It is often called the “building block of life”.

Definition of Tissue

A tissue is a group of similar cells that work together to perform a specific function.

Nature of Cells and Tissues

Cells are microscopic and perform all life processes. Tissues are formed by the organization of similar cells. Examples of tissues include muscle tissue, nerve tissue, connective tissue, and epithelial tissue.

Meaning of Growth

Growth refers to an irreversible increase in size, mass, or number of cells in an organism. It is a quantitative change.

Meaning of Development

Development refers to the qualitative changes and progressive differentiation of cells, tissues, and organs, leading to increased complexity and specialized functions. It includes maturation.

Differences between Growth and Development

The following are differences between growth and development:

Growth: Increase in size, mass, or cell number; quantitative change; stops at maturity.
Development: Increase in complexity and specialization; qualitative change; continues throughout life.

Cell Division

Cell division is the process by which a parent cell divides into two or more daughter cells. It is essential for growth, repair, and reproduction.

Stages of Cell Division (Mitosis)

The main stages of cell division (mitosis) are:

Interphase: The preparatory phase where the cell grows and copies its DNA.
Prophase: Chromosomes condense and become visible; nuclear envelope breaks down.
Metaphase: Chromosomes align at the metaphase plate (equator of the cell).
Anaphase: Sister chromatids separate and move to opposite poles of the cell.
Telophase: Chromosomes arrive at the poles, decondense; nuclear envelopes reform.
Cytokinesis: The cytoplasm divides, forming two distinct daughter cells.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 3 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to recall the basic units of life they learned in Basic Science. The teacher then introduces the topic “Cells and Tissues of Human Body”.
Pupils’ Activity: Pupils respond to questions and listen attentively.
Learning Point: Pupils are prepared for the new lesson.

Step 2: Definition of Cells and Tissues

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines a cell as the basic unit of life and a tissue as a group of similar cells performing a specific function. The teacher provides simple examples.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the definitions of cells and tissues.

Step 3: Nature of Cells and Tissues

Time: 5 minutes
Teaching Skill: Elaboration/Illustration
Teacher’s Activity: The teacher explains that cells are microscopic and carry out life processes. The teacher gives examples of tissues in the body (e.g., muscle, nerve, epithelial) and their general functions.
Pupils’ Activity: Pupils listen and contribute examples if possible.
Learning Point: Pupils grasp the fundamental nature and examples of cells and tissues.

Step 4: Growth and Development

Time: 5 minutes
Teaching Skill: Comparison/Explanation
Teacher’s Activity: The teacher defines growth and development, highlighting their key characteristics. The teacher then explains the differences between growth (quantitative change) and development (qualitative change and maturation).
Pupils’ Activity: Pupils listen, take notes, and ask questions.
Learning Point: Pupils can differentiate between growth and development.

Step 5: Practical Activity – Observing Cheek Cells

Time: 7 minutes
Teaching Skill: Demonstration/Practical Guidance
Teacher’s Activity: The teacher demonstrates how to prepare a cheek cell slide, stain it, and observe it under a microscope. Pupils are guided to observe prepared cheek cell slides, identify the cells, and briefly sketch what they see.
Pupils’ Activity: Pupils follow instructions, observe the cheek cells under the microscope, and make quick sketches.
Learning Point: Pupils gain practical experience in identifying human cells.

Step 6: Cell Division and Stages

Time: 10 minutes
Teaching Skill: Explanation/Visual Aid
Teacher’s Activity: The teacher explains the concept of cell division and its importance for growth and repair. Using charts, the teacher describes the main stages of mitosis (Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis), highlighting key events in each stage.
Pupils’ Activity: Pupils observe the charts, listen attentively, and note down the stages and their characteristics.
Learning Point: Pupils understand cell division and its various stages.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define a cell and a tissue.
State two differences between growth and development.
List the main stages of cell division.
Mention one importance of cell division in the human body.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher briefly summarizes the key points of the lesson, emphasizing the importance of cells and cell division. The teacher assigns homework: “Draw and label a typical animal cell and list three types of tissues found in the human body.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: The lesson is reinforced, and pupils are given a task to consolidate learning.

Lesson Keywords

Cell – The basic structural and functional unit of life.
Tissue – A group of similar cells working together to perform a specific function.
Growth – Increase in size, mass, or cell number.
Development – Qualitative changes leading to increased complexity and specialization.
Cell division – Process by which a parent cell divides into daughter cells.
Mitosis – A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus.

Differentiation

For pupils who grasp concepts quickly, they can be encouraged to research different types of tissues and their specific functions. For those who need more support, the teacher can provide simplified diagrams and allow more time for practical observation and drawing, offering individual guidance.

Note for teachers using this lesson plan

Ensure all necessary instructional materials, especially the microscope and slides, are prepared and in good working condition before the lesson. Emphasize safety during the practical session. Encourage active participation and questions from pupils. The practical observation of cheek cells should be swift and focused due to time constraints, with detailed drawing and labeling potentially assigned as homework.