The document outlines a science lesson for 9th grade students focusing on the cell as the unit of life. It includes instructional objectives, teaching aids, and methodologies to understand cell structure, types, and the historical context of cell discovery. The lesson emphasizes the modern cell theory and aims to develop students' observational skills and scientific attitudes.

1. A.I.C.E.S.R.
B.Ed Lesson Note
Name of Professor: S. S. Chepe Subject Lesson No.:
Name of School: - Lesson No.:
Std: 9th
Div: A Time: 1.00-1.30 P.M. Date: 16/8/14 Type of Lesson: Simulated -Herbart
Teaching Subject: Science and Technology Teaching Unit: Cell: The Unit of Life
Context: -
Entry Behaviour: Students have basic idea of cells.
Correlation: Life
Teaching Aids: Power point presentation, egg, onion, microscope, petridish, forcep.
Content Analysis:
Cell: The Unit of Life
*Cell: The Unit of Life Structural organization of cell Cell Organelles Prokaryotic and
Eukaryotic Cells
Cells: How many? Cell Theory Morphology of Cell
Instructional Objectives & Specifications:
1. The pupil acquires knowledge about Cells.
a) The pupil states who first invented microscope.
b) The pupil identifies various types of cells.
c) The pupil states what is cell.
2. The pupil develops an understanding of microscopes and cells.
a) The pupil distinguishes between simple, compound, electron and stereo microscope.
b) The pupil differentiates between various types of cells.
3. The pupil develops the skill of observing slides under microscope.
a) The pupil observes the cells of an onion.
b) The pupil develops the skill of handling the microscope.
4. The pupil develops an awareness of scientific attitude.
a) The pupil explains the importance of inculcation of scientific attitude amongst every individual.
Core Element: Inculcation of Scientific Temper.
Methodology: Herbart.
References: google, Biology Textbook Std. VII (ICSE Curriculum)

2. EXPERIENCE:
Teaching Points/Content Teacher Activity & Procedure Support System/CBW
Set Induction
Link Statement
Statement of Topic and
Scope
Presentation-
Sub unit 1- Concept of
cell-
Sub unit 2- Cells- How
many?
Subunit 3-
Morphology of cells-
(Size of the cell)
Good afternoon students. Students when you come to
school what do you observe?
Yes, many vehicles, people, houses, shops, vendors,
etc.
You must have also seen some bungalows, small
buildings or towers.
What is the common thing between the houses?
Do they all look same or are they different?
Do they have any common property?
What are the basic building blocks used to construct
them?
As we know that every structure is made up of some
blocks. Same is true for living beings. There are
millions of living beings on the earth but still they all
have the same building blocks known as “cell”.
So let us study today the basic unit of life i.e. cell in
detail along with its Structural Organization and
function of each of the cell organelles.
Teacher writes the name of the topic on CB.
Students, the cells were discovered by Robert Hooke
in the year 1655. He observed a thin slice of cork
under self designed microscope. These compartments
of the cork were empty. He found they resembled the
structure of honey comb and labeled them as “cells”,
which in Latin means “small rooms”. But these cells
were dead.
So every living thing, however different, is made up
of these separate tiny units called as cells.
Students, what do you think about the number of
cells in an organism?
Yes there can be an organism made up of single cell
known as unicellular organisms.
Name a unicellular organism.
There can be organisms with too many cells. What
do you think we can call them?
Yes they are multicellular organisms.
Larger the organism, larger the no. of cells in it.
Students, what do you think about the size of a cell?
Are you sure the cells are always very minute?
Teacher shows an egg and says that even an egg is a
single cell.
An egg and amoeba both are single cells.
Size of the cell varies greatly (0.1m to 18 cm)
Cell: The Unit of Life

3. Invention of Microscope
Sub unit 4-
Cell Theory-
Co-operative Activity
The unit used to measure size of the cell is
micrometer.
Why do you think that small size of cells is
beneficial?
Small size ensures greater surface area which in turn
ensures greater diffusion of the nutrients into
the cell.
What else can be the benefit of smaller cell size?
Yes, greater exchange of material in and out the cells.
It also ensures easy repair of the damaged cells.
But how do we observe these cells by naked eyes?
What can we use to enable us observe the minute
cells?
Microscope was first invented by Anton Van
Leeuwenhoek in 1673.
It was only when the electron microscope was
invented in 1940, that the study of cells became
possible.
Teacher shows some slides of microscope.
Teacher shows the gradual modification and
advancement in the technique.
Let us try to see some cells present in the onion peel.
Teacher mounts the peel with the help of students on
a slide. Teacher makes the student observe slide
under microscope.
Teacher asks to describe what it looks like?
Teacher makes the students to form groups and
discuss among them-
What are organs made up of?
Cell is said to be structural unit of life. Why?
It is also said as the functional unit of life. What
could be the reason for it?
Students what do you think about formation of new
cells?
From where can new cells be formed in the body?
How?
What happens to the existing cells?
How can we say that heredity takes place?
1 micrometer = 1/1000
millimeter
PPT
Microscope and slide of
onion peel.
The Modern Cell Theory
has following postulates-
1. All organisms are
made up of one or
more cells.
2. Cell is the structural
and functional unit of
life, i.e. all the vital
functions of an
organism occur within
the cells.
3. All cells arise from
pre-existing cells, i.e.
no cell originates
spontaneously but
comes into being only
by division of cells.
“Omnis celula a
cellula”
Every organism
starts its life as a
single cell.
4. Cells contain the
hereditary information

4. Recapitulation/
Summarization-
Application/
Evaluation-
Reflection
Action
Assignment
So students, today we have studied the Concept of
cell also the postulates of Modern Cell Theory. We
have seen that the size of the cell is from fraction of
millimeter to few centimeters. We have also studied
and observed various cells.
Teacher wipes the CB.
1. What is a cell?
2. Who invents cell?
3. How is simple microscope different than
compound, electron and stereo microscope?
Now students what do you think that the study of this
important component of every living being was
possible only after the invention of Microscope.
Would it have been easy for the scientists to
invent the microscope? What qualities are essential to
become an inventor or scientist?
Yes critical thinking.
What can you do to imbibe these qualities in
yourselves as well as your students?
Teacher gives assignment.
is passed from cell to
daughter cell during
division.
5. All cells are basically
the same in chemical
composition.
Prepare a chart depicting
the efforts of various
inventors in studying cells
and their functions.
Chalk Board Summary
Date:16/8/14 Subject: Science and Technology Std.-IX
Topic: Cell : The Unit of Life
Cell=Small rooms(Latin)
Definition-Smallest structural and functional unit.
Cells were first discovered by-Anton Van
Leeuwenhoek in 1673.
Unit to measure cell-1 micrometer = 1/1000 millimeter
Modern Postulates of Cell Theory-
1. All organisms are made up of one or more cells.
2. Cell is the structural and functional unit of life.
3. All cells arise from pre-existing cells, “Omnis
celula a cellula”
Every organism starts its life as a single cell.
4. Cells contain the hereditary information is passed
from cell to daughter cell during division.
5. All cells are basically the same in chemical
composition.