1 cell organization
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CellOrganisation
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• Unicellular organisms are organisms which
consist of single cell.
• Although simple, they are able to perform all
vital functions and living processes within a cell.
• They can feed, respire, excrete and move.
• They are sensitive to external and internal
conditions, and are able to reproduce and
grow.
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Amoeba sp.
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Amoeba sp.
Habitat
• Live in freshwater lakes, are
also abundant in damp soil
General characteristics• Enclosed by a plasma membrane.
• hanges its shape constantly as it
meets obstacles and responds to
stimuli.
Living processes
• !eeding
• Locomotion
• "espiration
• Excretion
• "espond to
stimuli
• "eproduction
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LivingLiving
processes ofprocesses ofamoeba sp.amoeba sp.
!eeding Locomotion
"eproduction
"espiration
Excretion
"esponses to
stimuli
http://method%20of%20feeding%20in%20amoeba.ppt/http://locomotion%20of%20amoeba.ppt/http://reproduction%20of%20amoeba.ppt/http://respiration%20of%20amoeba%20sp.ppt/http://excretion%20of%20amoeba%20sp.ppt/http://responses%20to%20stimuli%20of%20amoeba.ppt/http://responses%20to%20stimuli%20of%20amoeba.ppt/http://responses%20to%20stimuli%20of%20amoeba.ppt/http://excretion%20of%20amoeba%20sp.ppt/http://respiration%20of%20amoeba%20sp.ppt/http://reproduction%20of%20amoeba.ppt/http://locomotion%20of%20amoeba.ppt/http://method%20of%20feeding%20in%20amoeba.ppt/
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CellSpecialisation in
multicellular
organisms
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ell
Tissue
#rgan
$ystem
#rganism
The smallest unit of life capable of carrying out all
the functions of living things
A group of cells of the same type that
perform a specific function in organism
$everal types of tissue that carry out a
particular function
Several organs working together to perform a function
All the systems make up a
multicellular organism.
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Cell organisation in the
formation of tissues,organs and systems in
animals
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Some of the humans cells and their functions
ell !unction
%uscle cell Able to contract and relax and areinvolved in movement
&hite bloodcell
Involves in defence of the body againstdiseases
"ed blood cell Transports oxygen
'erve cell Receives and sends out nerve impulses
$perm Fertilises the ovum
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There are ( ma)or types of tissues in animals*
• Epithelial tissues• %uscle tissues
• onnective tissues
• 'erve tissues
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Epithelial Tissue
• !orm a skin surface and protect the
tissue beneath it.• !orm a lining layer for tubes or lines the
cavities of the body.
• +rotect against infection, mechanicalin)uries and dehydration.
• ndergo changes to form glands.
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Muscle Tissue
• ost abundant tissue in the body
$mooth muscle $keletal muscle ardiac muscle
• ontraction and
relaxation for
involuntary body
activities
-peristalsis
along digestive
tract
• /oluntary
movements
• ontract andrelax to move
the bone
• ontract to
pump blood to
all parts of the
body.
• 0nvoluntary
movements
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Connective tissue
• 1old the body together.
• !or example, bone,
cartilage, blood,tendons, ligament.
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Nerve Tissue
• Transmits and coordinates messages
around the body.
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cellstissuesorganssystems
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2iscards toxic
waste products+roduces off
spring
Absorbs and transports
oxygen and discards
carbon dioxide
3reaks down
complex food into
simple
substances for
easy absorptionby body cells
Systems
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Transports food
substances,
oxygen, hormones
and others to the
entire body
2efends the body
against disease
+rovides bodily
support and
protection to solf
internal organs
+roduces
hormones that
control the bodily
activities
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$kin surface to
protects the tissue
beneath it.
oordinates and
controls all bodily
activities related to
impulses and reactions
1elps in movement
of the body.
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Cell organisation inplants
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Some of the plants cells and their functions
ell !unction
+arenchymacell
!or support and storage
4ylem Transports water and mineral salts
$ieve tubeelement
Transports organic product ofphotosynthesis
ompanioncell
"egulates the metabolic activity of sievetube element
Epidermal cell!or protection and covering of other cellsbeneath
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Tissues of plants
%eristemictissue
permanent
tissue
Epidermaltissues
5roundtissues
/asculartissues
• $mall cell, thin walls, large
nuklei, dense cytoplasm, no
vacuole.
• 6oung, actively dividing
• !orm a layer to cover,
protect entire surface of
plant and reduces water
loss
• +rovides support
and strengthens
the plants
• Transports
water, food and
support
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3ears flowers,fruits, buds and
leaves
Anchors the plant,
absorbs water and
mineral, stores food.
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