this ppt is not mine i took from slideshare and did some edit on it i hope it helps you :)

1. Cells
The Building
Blocks
of Life

2. Cells
Tissues
Organs
Systems
Organism
Simple Tissues: Cells of the same type
work together to perform a specific
function
Complex Tissues: Several types of cells
work together to perform a specific
function
Different tissues work together to
perform a specific function
Several organs working together for a
common purpose
Various systems work together to form
the organism

3. Plant Cell Animal Cell

4. • Cells observed under the light microscope.
Plant Cell Animal Cell

5. What are Cells?
• Cell Are the basic structural and
functional units of life
• Cells can exist:
– Singly as independent unicellular organisms
– Or As part of multicellular organisms

6. Multicellular and Unicellular Organisms
-Cell Are the basic structural and functional units
of life
-Some organisms body is made up of single cell that
organisms are called : Unicellular Organisms
Eg:- Amoeba , Paramecium.
-other oraganisms body is made up of more
than one cell these organisms are called :
multicellular organisms.
Eg:- Human Body, different types of animals .

7. Cell Structure:
(1) Nucleus – The Control Centre
Function
• Control centre for cell’s activities
• Control cell division
• Contains genetic materials

8. Cell Structure:
(2h) Chloroplasts
Structure
Disc-like structures found in leaf
cells
Contains a chlorophyll - green
pigment
Function
Carries out photosynthesis
Chlorophyll absorbs light energy
which is converted to chemical
energy

9. Cell Structure:
(2) Plasma/Cell Membrane
Properties
• Present in ALL living cells
• Made up of fats and
proteins
• Controls the exchange the
substances between the
cells and their
environment

10. Cellulose Cell Wall
• Function
– Provides shape to the plant cells
– Protects cell

11. Comparing plant and animal cell
Plant Cell Animal Cell
1-Cell wall
2-chloroplast
1-Cell membrane
2-Nucleus
3-cytoplasm
4-vacuole

12. Differentiation
Red blood cell
Nerve cell
Xylem vessel cell
Muscle cell Epithelial cell
Root Hair cell

13. nose
trachea
bronchus
lungs
Respiratory system Blood circulatory system
Takes in oxygen from the surroundings.
Releases carbon dioxide and water
vapour into the surroundings.
Carries food, oxygen and water to
various parts of the body and
carries wastes away to be removed.
Muscular system
Enables movement
different systems
that is found in
human

14. From Cells to Tissues
Within a multicellular organism,
Cells of the same type are often arranged in groups to
form a simple tissue.
Some simple animal tissues are designed to:
Move a bone/organ by contraction Protect the structures beneath them
Muscle tissue Epithelial tissue

15. From Cells to Tissues
Within a multicellular organism,
Cells of different types can be arranged in groups to
form a complex tissue.
The different cells work together
to perform A SINGLE function.
Some complex animal tissues are designed to:
Carry electrical impulses Join all parts of the organism
Nerve tissue Connective tissue

16. From Cells to Tissues
Some simple plant tissues are designed to:
Protect a plant against injury and drying-out of its inner parts
Epidermal tissue
Some complex plant tissues are designed to:
Vascular tissue
Carry out photosynthesis
Photosynthetic tissue
Transport food and water to various
parts of a plant

17. From Tissues to Organs
• Different tissues in organisms are often grouped
together to form an organ.
It is responsible for carrying
out more complex functions.
•Most animal organs (heart, lungs, skin) are made up of
connecting tissues and some other specialised tissues.
The stomach wall consists of glandular,
muscular and connective tissues
The heart consist of muscular,
blood and connective tissues
An organ performs a number of different functions.
E.g. Our liver stores food and produces bile.

18. From Organs to Systems
•Different organs are then linked together to form a body
system.
•An organism is made up of different systems working
effectively individually as well as together in a group.
•A number of systems are found in complex organisms to
carry out essential bodily functions, such as:
- Ensure genetic diversity
- Digest food
- Eliminate wastes, etc.
The functions performed by a body system are
more complex than those performed by the organs.

19. From Systems to Organisms
• Different types of multicellular organisms are made up of
different numbers and types of systems.
Heart muscle
cell (a cell)
Heart muscle
(a tissue)
A group of similar cells
that are specialised to
perform a certain
function together to
form a tissues.
The heart (an organ)
A group of specialised
tissues that are
gathered in a certain
part of the body to
perform a particular
functions together to
form an organ.
Circulatory system
Various organs that
work together to
perform a major
function in the body
to form a system.
Different systems work individually,
but together, they make up the whole organism.

20. Thank you for Listening
Done by :Marwa Husni
For Tr .: Tessi
Class: Seven