Cell: The unit of life.

Before the first

microscope was invented around 360 years ago,

People were not aware of living world that was not visible to the naked eye.

Many Scientists

were observing and

describing unknown

world with the help of

Microscopes

Among them the most important scientists

mentioned are. . .

Athanasius Kircher

1601-1680

Zacharias Janssen

Among them the most important scientists

mentioned are. . .

Among them the most important scientists

mentioned are. . .

Jan Swammerdam

1637-1680

Among them the most important scientists

mentioned are. . .

Anthony Van Leeuwenhoek

1632-1723

Among them the most important scientists

mentioned are. . .

Robert Hooke1635-1702

Among them the most important scientists

mentioned are. . .

Robert Brown1773-1858

Felice Fontana1730-1805

Among them the most important scientists

mentioned are. . .

Discovery of the cell

Robert Hooke in the year 1665 observed thin

slices of cork under a simple

magnifying device he designed.

Discovery of the cell

He observed that the cork

resembled the structure of honey comb

consisting many empty box like cavities - Cells.

A significant observation

In 1831 Robert Brown noticed a

near- circular spot slightly more

opaque than the surrounding

areas.

A significant observation

Robert Brown claimed that this structure was an integral part of

the cell and called nucleus.

The Modern Cell Theory consists of three statements based on large body of scientific research. The orginal work was done by Schleiden, Schwan and Virchow

1. The cell is the fundamental unit of structure and function in living things.

2. All living things are composed of cells.3. Cells come from pre existing cells.

Cell is a functional and Structural Unit of LifeEach cell is a membrane bound body that contain all chemical molecules that help support organisms life.

Cell is composed of various parts.

Cell is made up of 3 basic components

1. Plasma membrane2. Nucleus3. Cytoplasm.

Plasma membrane is the outer most covering of the cell separates it contents from external environment.

Plasma membrane is semi permeable membrane and made up of fats and proteins.

Nucleus is the control centre of the cell and has a double layered covering called nuclear membrane

Nucleus contains genetic material (Chromosomes)Which will have DNA

* Nucleus* Membrane bound organelle* Cytoskeleton* Complex

* No Nucleus* No Membrane bound Organelle* No Cytoskeleton* Simple

. Cytoplasm• DNA• Plasma

Membrane

Eukaryotic Cell Prokaryotic Cell

Cytoplasm is the fluid substance that fill the cell and contain various organelle for various functions.

There are cells without nucleus they are called Prokaryotic cells. They do have Nucleoid

Cells with prominent nucleus are called Eukaryotic cells.

0.1 -10 micro metes 10 -100 micro metes

Paramecium

Vacuole

Chloroplast

Flagellum

Cellulose wall

Eye spot

Starch storage

Chlamydomonas

Cell Organelle is a specialised

membrane bound structure with in a

eukaryotic cell which perform specific task

Cell Organelle – Endoplasmic

Reticulum

Cell Organelle – Golgi

apparatus

Cell Organelle –

Mitochondrion

Cell Organelle – Chloroplast

Cell Organelle – Lysosome

Cell Organelle – Ribosome

Cell Organelle – Vacuole

Diversity in Cells

Diversity in Size

Diversity in Cells of a

Diversity in Cells

Diversity in Cells

Diversity in Cells

Diversity in Cells

Diversity in Cells

Diversity in Cells

Diversity in Cells size

Diversity in Cells size

Diversity in Cells size

Microscope

Microscope

Measure

International System Ruler

Exercise- Identify the parts

Exercise- Identify the parts

Exercise- Identify the parts

Exercise- Identify the parts

Exercise- Identify the parts