Lesson Note on Transport System: Transport Media and Blood Components for SSS 2

Class: Senior Secondary School 2 (SS2 / SSS 2)
Term: First Term
Week: 3
Age: 16 years
Duration: 45 minutes
Subject: Biology
Curriculum Theme: Physiological Processes in Animals and Plants
Previous Lesson: Transport System: Diffusion, Osmosis and Transport Structures.
Topic: TRANSPORT SYSTEM CONTINUES
Subject Matter: Media of transportation (blood, latex, cell sap, cytoplasm), components and structure of blood (white blood cells, red blood cells, platelets, and plasma).

Specific Objectives

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

Cognitive Domain:

• Define media of transportation.
• List the various media of transportation in plants and animals.
• Identify the main components of blood.
• Describe the structure and function of red blood cells, white blood cells, platelets, and plasma.

Affective Domain:

• Appreciate the importance of different transport media in living organisms.
• Show interest in learning about the transport system in animals and plants.

Psychomotor Domain:

• Observe and identify plant saps/latex as a transport medium.
• Draw and label the different components of blood.

Social Domain:

• Collaborate in group discussions about the different transport systems in living organisms.

Reference Materials

The following resources were used in planning this lesson:

• Senior Secondary Schools Education Curriculum
• State Unified Scheme of Work
• Modern Biology for Senior Secondary Schools by P. H. C. Okeke et al.

Instructional Materials

The teacher will teach this lesson with the aid of:

• Textbook
• Posters showing the components of blood
• Samples of leaves (pawpaw, cassava, allemande, rubber) that produce latex or sap
• Microscope and prepared slides of blood smear (optional for observation)

Rationale for the Lesson

This lesson helps pupils understand how essential substances are moved around within living organisms. Knowing about transport media like blood and plant saps enables pupils to appreciate the complex systems that support life, connecting to their own health and the environment.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of the circulatory system in animals and the general concept of transport in living things.

Lesson Content/Board Summary

Media of Transportation and Components of Blood

Media of Transportation

Media of transportation are the substances or fluids that carry materials from one part of an organism to another. These substances are vital for distributing nutrients, oxygen, hormones, and removing waste products.

The following are examples of transport media:

• In Animals:
  • Blood
  • Lymph
  • Tissue fluid
• In Plants:
  • Cell sap
  • Latex
  • Cytoplasm (for intracellular transport)

Blood

Blood is the primary transport medium in most animals. It is a specialized fluid connective tissue made up of different components.

The following are the components of blood:

• Plasma: This is the liquid matrix of blood, making up about 55% of its volume. It is mostly water (90%) and contains dissolved proteins, salts, hormones, nutrients, and waste products.
  • Function: Transports dissolved substances like glucose, amino acids, mineral salts, hormones, and waste products.
• Red Blood Cells (Erythrocytes): These are biconcave disc-shaped cells without a nucleus in mature mammals. They contain a red pigment called haemoglobin.
  • Function: Transport oxygen from the lungs to the body tissues and a small amount of carbon dioxide from tissues to the lungs.
• White Blood Cells (Leukocytes): These are larger than red blood cells, have an irregular shape, and contain a nucleus. They are fewer in number compared to red blood cells. There are different types, such as phagocytes and lymphocytes.
  • Function: Defend the body against diseases and foreign invaders (e.g., bacteria, viruses). Phagocytes engulf pathogens, while lymphocytes produce antibodies.
• Platelets (Thrombocytes): These are small, irregular-shaped cell fragments without a nucleus.
  • Function: Play a crucial role in blood clotting, which helps to stop bleeding after an injury.

Teaching Methods/Instructional Techniques

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

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher asks pupils about their understanding of “transport” in everyday life and how it relates to living organisms.
Pupils’ Activity: Pupils respond by giving examples of transport in daily life and in living things.
Learning Point: Pupils connect prior knowledge to the concept of transport in biology.

Step 2: Identification of Transport Media in Plants

Time: 8 minutes
Teaching Skill: Observation/Demonstration
Teacher’s Activity: The teacher instructs pupils to detach leaves of pawpaw, cassava, allemande, or rubber. The teacher then guides pupils to observe and make inferences on the milky or clear fluid (latex or sap) produced, explaining that these are examples of plant transport media.
Pupils’ Activity: Pupils detach leaves as instructed, observe the fluid produced, infer its purpose, and relate it to transport media in plants.
Learning Point: Pupils identify and understand physical examples of plant transport media.

Step 3: Definition and Examples of Media of Transportation

Time: 7 minutes
Teaching Skill: Explanation/Lecture
Teacher’s Activity: The teacher defines media of transportation and lists various examples in animals (blood, lymph, tissue fluid) and plants (cell sap, latex, cytoplasm), writing them on the board.
Pupils’ Activity: Pupils listen attentively, copy the definitions and examples into their notes, and ask questions for clarification.
Learning Point: Pupils define and list examples of transport media in both plants and animals.

Step 4: Introduction to Blood Components

Time: 7 minutes
Teaching Skill: Questioning/Introduction
Teacher’s Activity: The teacher introduces blood as the primary transport medium in animals and asks pupils to brainstorm the main components they think blood is made of.
Pupils’ Activity: Pupils identify plasma, red blood cells, white blood cells, and platelets based on their prior knowledge or general understanding.
Learning Point: Pupils identify the four main components of blood.

Step 5: Structure and Function of Blood Components – Plasma and Red Blood Cells

Time: 8 minutes
Teaching Skill: Explanation/Visual Aids
Teacher’s Activity: The teacher explains the structure and function of plasma and red blood cells, using posters or charts to illustrate their appearance and characteristics.
Pupils’ Activity: Pupils observe the visual aids, listen to the explanation, and take notes on the structure and functions of plasma and red blood cells.
Learning Point: Pupils understand the roles and features of plasma and red blood cells.

Step 6: Structure and Function of Blood Components – White Blood Cells and Platelets

Time: 5 minutes
Teaching Skill: Explanation/Visual Aids
Teacher’s Activity: The teacher continues the explanation by describing the structure and function of white blood cells and platelets, also utilizing visual aids for clarity.
Pupils’ Activity: Pupils observe the charts, listen to the explanation, and record notes on the characteristics and functions of white blood cells and platelets.
Learning Point: Pupils understand the roles and features of white blood cells and platelets.

Step 7: Evaluation/Review

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

1. What are media of transportation?
2. Mention two media of transportation found in plants.
3. List the four main components of blood.
4. State one function for each of the following: plasma, red blood cells, white blood cells, and platelets.

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 summarizes the key points of the lesson, emphasizing the importance of transport systems. The teacher then assigns homework: “Draw a labelled diagram illustrating the components of blood.”
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: Pupils reinforce their understanding and prepare for further study.

Lesson Keywords

• Blood – The main transport medium in animals.
• Latex – A milky fluid found in some plants, serving as a transport medium.
• Cell sap – The fluid found within the vacuoles of plant cells, involved in transport.
• Plasma – The liquid component of blood that holds the blood cells in suspension.
• Red blood cells – Blood cells containing haemoglobin, responsible for oxygen transport.
• White blood cells – Blood cells involved in the body’s immune system, fighting infection.
• Platelets – Small cell fragments in blood that help in clotting.

Differentiation

For pupils who are struggling, the teacher will provide simplified diagrams and allow peer tutoring. Advanced pupils will be encouraged to research specific diseases related to blood components (e.g., anaemia, leukaemia) and present their findings.

Note for teachers using this lesson plan

Encourage pupils to actively participate in the observation of plant saps. Use clear visual aids for blood components. If possible, show a short video clip of blood cells under a microscope to enhance understanding. Emphasize the connection between the structure and function of each component.