Basic 9 Science Term 1 Week 4 Lesson Plan

Display a picture of a professional sports team. Ask learners why each player has a specific role or position. Draw an analogy between specialized team players and specialized cells in organisms. Share learning indicators and introduce the lesson. Display a picture of a big machine or factory, composed of many parts, each with its specific function

Learners examine the Printed onion-root photomicrograph and identify regions containing actively dividing cells. Guide them to discuss how new cells may later undergo differentiation to develop structures suited to particular functions. Learners then examine the Printed blood-cell photomicrograph and identify visible differences among specialized human blood cells. They compare the shapes and structures shown in the two photomicrographs and discuss how cells in multicellular organisms become specialized for different functions. In groups, learners create a simple comparison table showing an example of a specialized plant cell and a specialized human cell, its important structural features and its function. Learners use the Modelling clay to construct one plant specialized-cell model and one human specialized-cell model. They label or point out the structural feature that helps each cell perform its function. Groups display their models and explain how specialization enables different cells to perform different roles while contributing to the survival of the whole organism. Assessment: 1. What is a specialized cell? 2. Explain what is meant by cell differentiation. 3. Give one example each of a specialized plant cell and specialized human cell. 4. State one structural feature that helps each example perform its function.

Use peer discussion and effective questioning to find out from learners what they have learnt during the lesson

Ask learners to think about what would happen if one part stops working Use this analogy to introduce the idea that plants, like machines, have specialized parts (cells) that ensure the plant functions effectively

Learners observe the Prepared leaf-epidermis slide with the Light microscope and identify epidermal cells and guard cells around a stoma. They compare the view with the Printed guard-cell and cambium and xylem chart and trace how guard cells regulate gas exchange, cambium produces new tissue and xylem transports water and supports the plant. Groups create a comparison table linking the structure of each specialized cell with its contribution to a dicotyledonous plant.

Take feedback from learners and summarize the lesson.

Share learning indicators and introduce the lesson.

Learners observe the Prepared leaf-epidermis slide with the Light microscope and identify epidermal cells and guard cells around a stoma. They compare the view with the Printed guard-cell and cambium and xylem chart and trace how guard cells regulate gas exchange, cambium produces new tissue and xylem transports water and supports the plant. Groups create a comparison table linking the structure of each specialized cell with its contribution to a dicotyledonous plant.

Use peer discussion and effective questioning to find out from learners what they have learnt during the lesson. Take feedback from learners and summarize the lesson.