cell - fundamental unit of life
DESCRIPTION
hi this is a nice presentation for 9th class cbse studentson cellsTRANSCRIPT
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CellThe Cell is the structural and
functional unit of life.All living organisms are made up of cells.It is the smallest living entity found in living organisms.
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Cell was introduced by Robert Hooke in 1665
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Pattern of cells
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Properties of cellThe Cell is the smallest living unit of life.It is so small that it is not visible to the naked eye.The shape of the cell varies in different organisms and within an organism.Size of cells also differs.All living cells exhibit certain basic properties like respiration, growth, metabolism etc.Cells originate from a pre-existing cell. A mother cell divides to produce daughter cells. Hence, cells exhibit cell division.
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Unicellular Organismsuni means single
The organisms which are made up only of a single(one) cell.
Eg. Amoeba, chlamydomonas, paramoecium and bacteria
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Amoeba contains only one cell
Single cell
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Multicellular Organisms
multi means many• The organisms which are
made up of more than one cell.
Eg. Animals,plants,insects,birds,lizards
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The three main parts of a cell:-
Plasma (cell) memberane NucleusCytoplasm
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Cell memberane
Nucleus
Cytoplasm
Main parts of a cell
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Plasma membrane
It is the outermost cover of the cell that separates the content of the cell from the surrounding
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Cell membrane is called selectively permeable membrane
Because it allows or permits the entry and exit of some specific materials in and out of the cell
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Cell wall or plasma membrane
Content of cell
surrounding
water
O2 and CO2
You can not go outside
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Gases like O2 and CO2 move in and out of the cell by the
process of DIFFUSION
Diffusion : It is the intermixing of the particles
of two matters
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MATTER-1 MATTER-2
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After diffusion
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The things always move from more to less quantities
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In and out of O2 and CO2
It occurs by the process of DIFFUSION
As soon as there is difference in the concentration of O2 or CO2 inside and outside of the cell, O2 or CO2
moves from a region of high to low concentration region
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If the concentration of CO2 or O2 is low in cell than
outside, then the gases will go inside the cell and if
reverse happens then gases will go outside the cell.
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Exchange of gases
O2 or CO2
Cell
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Osmosis
It is the flow of water from a region of high water
concentration to a region of low water concentration
through a semi permeable membrane
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Movement of water
In and out of water occurs by the process of OSMOSIS
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If we put an animal cell or a plant cell into a solution of sugar or
salt in water
Three things may happen
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If the concentration of water is low in cell than surrounding, the water will move from outside to the cell and it will swell up and such a solution is called Hypotonic solution
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Water in the solution
Water in the cell
Hypotonic solution
Flow of water from solution to cell
Surrounding of cell
Solution of sugar in water
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If the concentration of water is same in cell as that of surrounding, there will be no net movement of water and solution is called isotonic solution
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Water in the solution
Water in the cell
Isotonic solution
Same water concentration in solution and cell
Surrounding of cell
Solution of sugar in water
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If the concentration of water is higher in cell than surrounding, the water will move from inside to the solution and it will shrink and such a solution is called Hypertonic solution
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Water in the solution
Water in the cell
Hypertonic solution
Surrounding of cell
Solution of sugar in water
Flow of water from cell to solution
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Applications of osmosis
Unicellular fresh water organisms and most plant cells gain water
through osmosisMovement of water from roots to
other parts of plants occurs by osmosis
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Cell wallThis is the extra or additional rigid cover to the plasma or
cell membrane. It is found only in plant cells
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Cell memberane
Cell wall
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PLASMOLYSIS
When a living plant cell loses water
through osmosis, there is a shrinkage in
the contents of the cell. This phenomenon
is known as plasmolysis
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THE NUCLEUSThe nucleus has a double layering cover called nuclear membrane.Nuclear membrane has pores which allows transfer of material from nucleus to cytoplasm
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Nucleus contains chromosomes which are
rod-shaped structures
chromosomes are composed of DNA and proteins
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Importance of chromosomes
They contain information for the inheritance from
parents to next generation in the form of
DNA
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DNA-Deoxyribo
Nucleic Acid
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Functional parts of DNA are called GENES
GenesDNAChromosomes
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Prokaryotes
Organisms whose cell has not the nuclear
membrane are known as Prokaryotes eg.
bacterias
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In prokaryotic organisms cell has not nuclear
membrane and nuclear region contain only nucleic acids and called nucleoid
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Eukaryotes
Organisms with cell having the nuclear
membrane are known as Eukaryotes eg.
Animals,plants
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Prokaryotic Cell Eukaryotic Cell
1. Size is generally small
1. Size is generally large
2.Nuclear region is undefined and called nucleoid.
2.Nuclear region is well defined and surrounded by a nuclear membrane.
3.They have single chromosome.
3.More than one chromosome.
4.Membrane-bound cell organelles are absent
4.Membrane enclosed organelles
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organellesNucleus
membrane
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Cell Organelles
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Endoplasmic Reticulum(ER)
Smooth Endoplasmic
Reticulum(SER)
Rough Endoplasmic Reticulum(RER)
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RERIt looks rough under a microscope
because it has particles called ribosomes attached to its surface.
Ribosomes are the sites of protein manufacture
The manufactured proteins are then sent to various places in the cell.
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SERIt helps in the manufacture of fat
molecules or lipidsSome of these molecules or lipids help in building the cell
membrane. This Process is known as membrane biogenesis.
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Golgi ApparatusThe material manufactured near the ER is packaged and dispatched to various targets
inside and outside the cell through the golgi apparatus
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FunctionIt includes the storage, modification and packaging of products in vesiclesIt is also involved in the formation of lysosomes
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SER
RER Golgi Apparatus
proteins
Fat or lipids
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LysosomesFunctions:-
They help to keep the cell clean by digesting any foreign material such as bacteria or food or old cell organelles.They are able to do so because they contain powerful digestive enzymes
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Lysosomes are known as “Suicide bags of a cell”
During any disturbance in cell, cell gets damaged.because of that lysosomes may burst and the enzymes digest their own
cell.
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Lysosomes
Old cell organelles
Foreign materials
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MitochondriaThey areknown as the “Powerhouse of the cell”
The energy required for various chemical activities needed for life is
realeses by mitochondria in the form of ATP
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ATP-Adenosine triphopshateATP is known as the energy
currency of the cellOur body uses energy stored in ATP
for making new chemical compounds
ATP
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Mitochondria are strange organelles
Because they have their own DNA and ribosomes
Therefore they are able to make their own proteins.
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Plastids
•They are present only in plant cells.
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Plastids
Chromoplsts(coloured plastids)
Leucoplasts(white or colourless
plastiids)
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Plastids containing the pigment chlorophyll are known as chloroplasts.
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Like mitochondria,Plastids also have their own DNA and ribosomes
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VacuolesThey are storage sacs(pouch)
for solid or liquid contentsVacuoles are small in size in
animal cells while they are large in plant cells.
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Many substances of importance in the life of plant cell are stored in
vacuoles eg. Amino acids,sugars,proteins etc.
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In Amoeba, the Food vacuole contain the food items that the
amoeba has consumed