Tissues Class 9 ppt

TISSUES
Muticellular organisms are made of millions of cells.Cells show division of labour and each cell
performs a particular function efficiently. Such cells are grouped together and is called tissue.
TISSUE : A group of cells that are similar in structure and origin (come from same parent cell) and
perform similar function.
HISTOLOGY : Study of tissues
What is the utility of tissues in multi-cellular organisms?
Multi-cellular organisms have millions of cells. Each group of cell is called tissue and it performs a
special function efficiently.eg: muscle cells (contract and relax to bring movement), nerve cells (carry
message) and blood, all are tissues. In plants, vascular tissues (xylem and phloem )conduct water and
food from one part of the plant to other parts. So, multi-cellular organisms show division of labour.
PERIOD 1

ARE PLANTS AND ANIMALS MADE OF SAME TISSUES?
Due to difference in structure and function of plants and animals,they are made of
different types of tissues.
PERIOD 1

NOTEBOOK WORK:
SUBTOPIC: ARE PLANTS AND ANIMALS MADE OF SAME TYPES OF CELLS
Tissue : A group of cells that are similar in structure and origin (come from same parent cell) and
perform similar function.
1. Are the tissues present in plants and animals same?
2. In unicellular organisms,a single cell carries out all the functions,what about multicellular
organisms?
3. Intext Q2 pg 69
PERIOD 1

MERISTEMATIC TISSUE (MERISTEM)
• have the power to divide to form new cells.
• increase the length and girth (width) of plants and are found in growing areas of plants.
• new cells that are produced by the meristem are similar to the meristem,but as they grow their characteristics change
and they differentiate.
CHARACTERISTICS : Cells are active (living),have dense cytoplasm,thin cellulose walls, prominent nuclei and lack
vacuole as vacuoles provide rigidity to cells and prevent quick cell division. Cell needs a dense cytoplasm and soft cell
wall for cell division. (ACC NV)
TYPES OF MERISTEMATIC TISSUE DEPENDING ON THEIR LOCATION
MERISTEMS https://www.youtube.com/watch?v=KKgqNHaCxh8
ACTIVITY 6.1 NCERT
TYPE LOCATION FUNCTION
i) APICAL MERISTEM Growing tips of shoot(shoot
apex meristem) and root (root
apex meristem)
Increases length(height) of the plant
– PRIMARY GROWTH
ii) INTERCALARY MERISTEM At base of leaves or internode Increase in length of organ like
leaves and internodes
iii) LATERAL MERISTEM
(found in woody trees and
plants)
On sides of stem and roots.
2 TYPES -
1. cork cambium
(found beneath bark)
2. vascular cambium
(found in vascular bundles)
Increase the diameter and girth –
SECONDARY GROWTH
PERIOD 2

RECAP:
1. What is the unique feature of meristem?
2. Growth in plants is restricted to certain regions.Explain.
3. What happens to apical meristem when it looses its ability to divide?
4. Draw a well labeled diagram to show various types of meristematic tissue and their
location.
5. What type of tissue is found at the shoot apex?Name one more part of plant body where
this type of tissue is found.
6. Why vacuoles are absent in the cells of meristematic tissue?
7. Do the roots of a plant continue to grow after their tips are removed?Give reason.
NOTEBOOK Q’s:
Draw flow chart of slide 4
1. Define meristematic and permanent tissue
2. INTEXT Q2 PG74
PERIOD 2

PERMANENT TISSUES
• tissue that comes from meristematic tissue and are matured.
• made of dead cells that have lost the power to divide.
• have a definite shape,size and function and may be dead or living.
• The process by which cells arise from meristematic tissue and take up a permanent
shape,size and function is called DIFFERENTIATION.
• NCERT ACT 6.2 (LAB SECTION OF STEM)
PERIOD 2

TYPES OF SIMPLE PERMANENT TISSUE
PARENCHYMA (living cells) COLLENCHYMA (living cells) SCLERENCHYMA (dead cells)
C
H
A
R
A
C
T
E
R
• is the basic (most simple) packaging tissue
that fills the spaces between other tissues
and is found most abundant in plants
• has unspecialised/undifferentiated cells
with thin cell walls made of cellulose
• have large intercellular spaces as the cells
are loosely packed
• cells have nucleus, dense cytoplasm and
large vacuole
• cells are living, elongated and irregularly
thick at the corners made of cellulose or
pectin
• have vey less/no intercellular spaces
• cells have a nucleus, dense cytoplasm
and large vacuole
• long, narrow thick walled cells due to
deposition of lignin (a chemical substance
which acts as cement and hardens
them).Such cell walls are called lignified
walls and have pits.
• no intercellular spaces due to lignin
deposits
• cells do not have a nucleus and cytoplasm
F
U
N
C
T
I
O
N
• Provides support to plant and parenchyma
of stem and roots stores nutrients and
water and is called storage parenchyma
• When it contains chloroplasts having
chlorophyll and performs photosynthesis,it
is called chlorenchyma
• In aquatic plants,parenchyma has large air
spaces to provide buoyancy to plants to
help them float and exchange gases ,it is
called aerenchyma.
• provides flexibility and mechanical
support to the aerial parts of plants
(leaves, stem) and allows them to bend
easily without breaking.
•Prevents tearing of leaves
• gives rigidity and strength to the plant
and makes it hard and tuff to bear stress
and strains
L
O
C
A
T
I
O
N
Found in non woody or soft parts of
roots,stem,leaves,flower ,fruits
Transverse
Section
Found in leaf stalks ,below epidermis of
leaves and stem
Found in stems ,around vascular bundles,in
the veins of leaves
Ropes,mats made of jute,linen and hemp
used in textiles,hard shells like that of
walnut ,husk of coconut and seed coat are
all formed of sclerenchyma cells
PERIOD 3

RECAP:
1. State the major difference between meristematic and permanent tissues.
2. Name the 3 simple permanent tissues.State their location and function.
3. Differentiate between the three types of simple permanent tissues on the basis
of their cell walls.
4. Which tissue is called packaging tissue in plants?
5. Which chemical is deposited at the corners of cells of collenchyma?
6. Intercellular spaces are absent in sclerenchyma.Why?
7. Water hyacinth floats on water surface.Explain.
8. Name the tissue that is dead and has no intercellular spaces.
9. Name the tissue that makes husk of coconut and write its any 3 characteristics.
10. What is chlorenchyma?State its functions.
11. How simple permanent tissues are different from complex permanent tissues in
plants?
12. Draw neat diagrams showing the transverse and longitudinal sections of simple
permanent tissues.
13. Branches of trees move and bend freely.Explain.
PERIOD 3

EPIDERMIS
ACTIVITY 6.3 pg 72
1. Take a fresh leaf of Rheo.
2. Stretch and break it by applying pressure.
3. While breaking it, keep it stretched gently so that some peel or skin projects out from the cut.
4. Remove this peel and put it in a Petri dish filled with water and add a few drops of safranin.
5. Wait for few minutes and then transfer it onto a slide. Gently place a cover slip over it and observe under microscope.
When observed under microscope,outermost layer of cells called EPIDERMIS (epidermal tissue) is seen. It is
a protective layer whose main function is to protect plant from excess hot/cold and infection. It is made
of single layer of cells that are flat with no intercellular spaces. Their outer and side walls are thicker
than the inner wall.
• In plants of dry habitats, the epidermis is thick to prevent water loss and has thick waxy layer of CUTIN
( water proof substance).
• In aerial parts of the plant,epidermis secretes CUTICLE ,a waxy, water-resistant layer made of CUTIN on
their outer surface. Cuticle prevents loss of water, mechanical injury and invasion by parasitic fungi.
• Epidermal cells of the roots have long root hair which increase the surface area for absorption of water.
PERIOD 4

PERIOD 4
EPIDERMIS
Structure Function
Layer of cells covering surface of entire plant. Acts as a barrier to microorganisms and pathogens.
Layer is thin and transparent.
Allow light to pass through for photosynthesis in the
tissues below.
Epidermal tissues have tiny hairs projecting from
surface of epidermis. Trichomes are abundant in
some plant leaves.
Leaf trichomes trap water to prevent water loss.
Root hairs are elongations of epidermal cells in the
root.
Root hairs increase the surface area for absorption of
water from the soil .
Epidermal tissues in leaves are covered with a
waxy cuticle.
The waxy cuticle prevents water loss from leaves.
Some epidermal cells secrete poisonous or bad-
tasting substances.
The bitter taste of the substances prevent grazing by
animals.

STOMATA : Epidermis of leaf has pores stomata surrounded by two kidney-shaped guard cells.
FUNCTION OF STOMATA:
• exchange of gases.
• transpiration (loss of water in the form of water vapour).It helps in conduction of water and
minerals from root to other parts of plant.
Is the outer layer of a branch of a tree different from the outer layer of a young stem?
As plants grow older, the outer protective tissue called epidermis changes. It is replaced by
secondary meristem which gives new cells on both sides.Cells on the outside are cut off from
this layer. This forms the several-layer thick cork or the bark of the tree. Cells of cork are dead
and tightly arranged without intercellular spaces .They have a chemical called suberin in their
walls which makes them impervious to gases and water.
CORK : protective in nature,prevents loss of water from plant and injury.As it does not catch fire
easily and is light,it is used as an insulator and in sports goods.
Structure of CORK, a protective tissue
CORK
PERIOD 4

RECAP:
1. Name the protective tissue present in plants.
2. What is the role of epidermis in plants?
3. State the characteristics of cells of epidermis.
4. Draw a diagram of leaf epidermal peel showing stomata and label its parts.
5. How does a cork act as a protective tissue?
6. Which structure/tissue protects the plants body against the invasion of
parasites?
NOTEBOOK Q’s:
1. TBQ 4
2. TBQ 12
3. INTEXT Q3 PG 74
4. TBQ 13
5. TBQ 5
6. TBQ 14
PERIOD 4

COMPLEX PERMANENT TISSUES
Made of more than one type of cells that have a common origin and work together to do a
common function.
Present in complex plants and help a plant to survive in terrestrial environment (land).
FUNCTION: transport water,minerals and food to all parts of plants
COMPLEX PERMANENT TISSUE TYPES
XYLEM PHLOEM
1. tracheids 1. sieve tubes
2. vessels/tracheae 2. companion cells
3. xylem parenchyma 3. phloem parenchyma
4. xylem sclerenchyma 4. phloem fibres
Both the conducting tissues (xylem and phloem)are called VASCULAR TISSUES and
together form vascular bundles.
X (VT) + P(VT) = VB
xylem (vascular tissue) + phloem (vascular tissue) = vascular bundle
PERIOD 5

COMPLEX PERMANENT TISSUE
XYLEM (wood):
1. Cells have thick walls
2. Elements are tracheids,vessels,xylem parenchyma,xylem sclerenchyma
3. Vessels are most important element and are shorter and wider than
tracheids
4. Vessels and tracheids have tube like structures (tubular)that helps in
transporting water and minerals vertically efficiently.
5. Xylem parenchyma stores food and helps in lateral conduction of water
6. In addition to transporting water and mineral salts from roots to leaves,
xylem also provides support to plants and trees because of its tough
lignified vessels.
PHLOEM (bast) :
1. Sieve tubes are tube like structures
2. Elements are sieve tubes,companion cells,phloem parenchyma,phloem
fibres
3. The end walls are called sieve plates and are perforated due to presence
of pores
4. Phloem transports the prepared food from leaves to storage organ and
from storage organs to growing regions.Hence materials can move in
both the directions in it
PERIOD 5

XYLEM
• Conducts water and minerals
• Conduction takes place in one direction
• Conducting channels are tracheids and vessels
• Only xylem parenchyma is living,all other
elements are dead
• Xylem conducts and gives mechanical strength
also due to presence of lignified vessels
PHLOEM
• Conducts food
• Occurs in 2 directions – upward and downward
• Conducting channels are sieve tubes
• All elements are living only phloem fibres are
dead
• Phloem conducts,gives no mechanical strength
PERIOD 5

RECAP:
1. Name the vascular tissues present in plants and state their function.
2. What constitutes xylem and phloem?
3. Name the dead elements of xylem and phloem.
4. Draw a neat diagram of the tissue that is responsible for translocation of food in
plants.
5. Differentiate between vessels and tracheids.
6. How simple permanent tissues are different from complex permanent tissues in
plants?
NOTEBOOK Q’s:
1. TBQ 2
2. INTEXT Q 4 PG 74
PERIOD 5

ANIMAL TISSUES
ON THE BASIS OF FUNCTION
PERIOD 6
EPITHELIAL
TISSUE
CONNECTIVE
TISSUE
MUSCULAR
TISSUE
NERVOUS
TISSUE

EPITHELIAL TISSUE (simplest tissue)
• covering or protective tissue that is separated from underlying tissue by fibrous
basement membrane.Hence always grows on other tissue.
• can be simple (made of one layer of cell) or stratified (made of many layers of cells)
CHARACTERISTICS:
1. Tightly packed cells to form a continuous sheet
2. Almost no intercellular spaces
LOCATION:
Skin, lining of mouth, blood vessels, alveoli, kidney tubules
It covers the organs and cavities inside the body and separates different systems from
each other.As it forms the outer layer of skin ,it protects the body from drying, injury,
and infections.
NOTE: As whatever that enters the body or leaves the body,must cross atleast one
layer of epithelium (SQUAMOUS EPITHELIUM),permeability of cells of epithelium
is important for exchange of substances.
PERIOD 6

CLASSIFICATION OF EPITHILIUM
On the basis of :
NUMBER OF LAYERS
SIMPLE (made of single cell layer) STRATIFIED (made of many cell layer)
CELL SHAPE
https://www.youtube.com/watch?v=mpH0DHHQ2cs
PERIOD 6

TYPES OF EPITHELIAL TISSUE
Different epithelia show different structures as they perform different functions
PERIOD 6
Type of Epithelium Structure Location in the body Function
Squamous epithelium Cells are thin, flat, irregular cells
which fit like floor tiles to form
delicate lining called PAVEMENT
EPITHILIUM
Nuclei in centre
Oesophagus,lining of mouth,
alveoli of the lungs, blood vessels
Protects the underlying
tissue from injury,grems
Exchange of gases in
lungs and materials
between cells and blood
Cuboidal epithelium Cells are cuboidal with round
nucleus in centre
Nuclei in centre
Kidney tubules, duct of salivary
glands
Gives mechanical support
At times the epithelial
tissue folds,forms a gland
that secretes substances.
Such epithilium is called
GLANDULAR EPITHILIUM
Columnar epithelium Cells are more tall and less wide
(PILLAR LIKE), placed side by
side. Nucleus is situated near
the base.
Nuclei near base
Inner lining of intestine,
In respiratory tract,cells have cilia
(hair like ) that move and push
the mucous to clear it.Such
epithilium is called CILIATED
COLUMNAR EPITHILIUM
Helps in absorption
excretion and secretion
Striated squamous
epithelium
Squamous flat cells arranged in
many layers to prevent wear and
tear of parts.
Skin (to prevent wear and tear)
tongue, oesophagus lining of
mouth.
Protection, prevent wear
and tear

RECAP:
1. Name the tissue that is protective tissue in animals.
2. Which epithelium is also called pavement epithelium?
3. Name one organ where ciliated epithilium is present.State the function of
ciliated epithilium in the organ.
4. Differentiate between different types of epithilium and draw diagrams for each.
PERIOD 6

CONNECTIVE TISSUE
Connects various tissues together in any organ.Most abundant among all animal tissues.
FUNCTION: binding,supporting and packing of organs of the body.
CHARACTERISTICS:
Few cells,loosely packed ,large intercellular spaces filled with jelly like substance called matrix.
blood (connects all tissues and organs) bone
has fluid matrix(ground substance) called forms skeleton that supports body and anchors
plasma which has proteins,salts and hormones muscles.It is a strong and non-flexible tissue in
in which RBC,WBC,platelets are lying.It transports which bone cells are embedded in a hard matrix
gases,food,hormones and waste to parts of body made of calcium and phosphorous compounds
ligament n tendons cartilage (widely spaced cells)
LIGAMENTS connects bone bone.It is elastic, hard elastic tissue softer than bone.Matrix is solid
has strength and very less matrix. but elastic due to presence of protein called
TENDONS connect muscle bones.They are CHONDRIN which is why we can bend a cartilage
less elastic,fibrous tissue with great strength and but not the bone.It smoothens the bone
more matrix. sufraces at joints and also found in nose,ear,
trachea,larynx
areolar tissue adipose tissue
It fills space inside the organs,supports internal stores fat.Found below the skin and b/w
organs and helps in tissue repair.Found between internal organs.Cells are filled with far globules.
skin - muscles,around blood vessels and bone marrow. It acts like an insulator due to presence of fats.
PERIOD 7

RECAP:
1. Name the tissue that is most abundant in the animals.
2. Name the tissue that helps in transportation of substances to various parts of
body.Write its composition.
3. Why is blood called a connective tissue?
4. Differentiate between ligaments and tendons.
5. Difference between areolar and adipose tissue.
PERIOD 7

MUSCULAR TISSUE
FUNCTION: It is responsible for the movement in the body.
CHARACTERISTICS : Cells of muscular tissue are long and called muscle fibres. Muscles have
special proteins called CONTRACTILE PROTEINS which contract and relax to bring movement.
TYPES OF MUSCULAR TISSUE
PERIOD 8
STRIATED UNSTRIATED CARDIAC

TYPES OF MUSCLE TISSUE
PERIOD 8
STRIPED or STRIATED/ SKELETAL/
VOLUNTARY MUSCLE FIBRES
UNSTRIPED or NON-STRIATED /
INVOLUNTARY MUSCLE FIBRES
CARDIAC MUSCLE FIBRES
Called striped or striated muscles as they
have light and dark bands or striations.
Called voluntary muscles as they move as
per our will.
Called skeletal muscles as attached to all
bones and help in movement.
Called unstriped/non striated
muscles as they do not show light
and dark bands.
Called involuntary as they do not
move as per our will.
Structure in between striated and
non-striated muscle fibres and are
involuntary.
These muscles show rhythmic
contraction and relaxation
throughout life and pump blood.
STRUCTURE
• long cylinder shaped unbranched cells
• multinucleated (many nuclei)
• fibres arranged in form of bundles
• have dark and light bands
STRUCTURE
• spindle shaped cells
• uninucleated
• fibres arranged in form of sheets
• dark and light bands absent
STRUCTURE
• short cylinder shaped,branched cells
• uninucleated
• fibres arranged in form of network
• faint dark and light bands
LOCATION
Limbs (arms,legs),tongue,body,face neck
LOCATION
Iris,ureters,bronchi of lungs,
alimentary canal wall,blood vessels
LOCATION
walls of heart
WORKING Contract quickly but can't
remain contracted for a long .So get
fatigued/tired.
WORKING Contract slowly but can
remain contracted for long .So don’t
get fatigued/tired.
WORKING Contract quickly and
rhythmically.Therefore do not get
fatigued/tired.

RECAP:
1. Name the tissue responsible for movement.
2. What is the role of contractile protein in muscles?
3. What is the specific function of cardiac muscles?
4. Why are skeletal muscles known as striated muscles?
5. How do cardiac muscles resemble both striated and smooth muscle fibres?
6. Write two differences b/w the muscles present in limbs,wall of alimentary canal
and heart.Support your answer with diagrams.
7. In what way are the various muscle fibres different with respect to the number
of nuclei?
8. Voluntary muscles are known as skeletal muscles.Justify.
PERIOD 8

NERVOUS TISSUE
Cells of nervous tissue are called NERVE CELLS or NEURONS.Many nerve cells are bound by
connective tissue to make a nerve.
FUNCTION:
1. highly specialised tissue that helps in transmitting stimuli from one place to other in the
body.
2. controls all activities of the body.
LOCATION: Brain,spinal cord and nerves are made of nervous tissue.
STRUCTURE: Its structure looks like a tree with branches coming out of it.
A neuron has 3 parts –
1. a star shaped body called CYTON which has nucleus and cytoplasm
2. a single long part called AXON(carry messages away from cyton)
3. short ,branched part called DENDRITES(carry messages towards cyton).
PERIOD 9

RECAP:
1. Name the tissue that transmits stimulus in the body.
2. State the function of nerve cells .Where do we find them?
3. Explain structure of neuron with the help of a diagram.
4. Differentiate between axon and cyton
NOTEBOOK Q’s:
DRAW FLOW CHART OF SLIDE 18
1. INTEXT Q 4 PG 78
2. TBQ 8
3. TBQ 6
4. Intext Q1 PG 78
5. TBQ 7 AND INTEXT Q 3 PG 78 (CLUBBED)
6. INTEXT Q2 PG 78 AND TBQ 9 (CLUBBED)
7. TBQ 11
PERIOD 9

Tissues Class 9 ppt

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Tissues Class 9 ppt