Teacher Sciece Script

Example 13 Theme:

Man And The Variety Of Living Things

Learning Area:

Cell as a unit of life

Learning Objective:

Understanding cells

Learning Outcome:

A student is able to : • state the function of each cell structure • state the similarities and differences between the two cells

Materials:

Activity Sheet 1 and 2, Matching Cards and colour pencils

Teacher:

Hi, I am sure you have read about the functions of each cell structure. I am giving you Activity Sheet 1 and you have to follow the instructions on it. Teacher gives out Activity Sheet 1 and reads out the instructions on it. Let us read the instructions together. First, circle in black all the parts of a basic living unit. Then underline in blue the functions of each part of a cell. Next, underline in green the part of a cell which contains hereditary material. Now, try to do it yourself. Allow time for students to carry out the activity. Let us go through the answers. Can I have your answers? Just put up your hand. Yes, your answers are correct. The parts of a basic living unit are the cell membrane, cytoplasm, and nucleus. Besides these, the plant cell has cell wall and vacuoles. The cell membrane controls the movement of substances in and out of the cell. The cytoplasm is where the chemical processes of the cell take place. The nucleus controls all the cell activities. Cell wall of the plant supports and gives shape to the cell. Vacuoles contain cell sap. Chlorophyll, found in chloroplast is important in photosynthesis The part of a cell which has hereditary material is the nucleus which contains chromosomes. Teacher shows labeled activity sheets of the plant and animal cell. These are the correct labels. Did anyone labeled any of these wrongly? It is alright to make mistakes, but correct them. Teacher gives out Activity Sheet 2. I want you to compare and contrast plant and animal cells. Try by filling in the blanks in Activity Sheet 2. Students fill in the blanks in the graphic organizer. They can work in groups or pairs.

Activity Sheet 1 Under The Microscope Read the text below and then follow the instructions The basic cell structure includes the cell membrane, cytoplasm and nucleus. The membrane of the cell is the thin outer most layer of a cell. It controls the movement of substances in and out of the cell. Cytoplasm is the jelly-like, and colourless part of a cell. The chemical processes of the cell happen in the cytoplasm. The nucleus is the most important part of a cell as it controls all the cell activities. The nucleus contains chromosomes. Plant cells contain green pigment which is called chlorophyll. Chlorophyll is used during the process of photosynthesis. The plant cell wall is made of cellulose which supports and gives shape to the cell. Vacuoles inside a cell contain cell sap (water and soluble substances). Instructions i. Circle in black all the parts of a basic living unit. ii. Underline in blue the functions of each part of a cell. iii. Underline in green the part of a cell which contains hereditary material.

Activity Sheet 2 Under The Microscope Graphic Organizer Instructions: Compare and contrast plant and animal cells by filling in the blank boxes.