It is the presentation about the cell for grade/class 7

1. Cell

2. About Cell
Cells are the structural and functional of
all living beings. They are known as the
building blocks of life. Each cell contains
a fluid called the cytoplasm, which is
enclosed by a cell membrane. Moreover,
cellular structures called cell organelles
are suspended in the cytoplasm.

3. Discovery of Cell
Cell was discovered by an English scientist named
Robert Hook (1635 to 1703) in 1665AD which is
about 358 years ago . In his book "Micrographia"
published in 1665, Hooke described his observations
using the compound microscope, which was a newly
invented instrument at the time.

4. Cell Theory
The cell theory is a fundamental
principle in biology that describes
the basic properties and
functions of cells. Hooke
discovered a multitude of tiny
pores that he named cell. New
cells are formed by the pre-
existing cell.

5. Functions of Cell
The functions of cell are listed below:
i) 1.Cells are the building blocks of all living organisms.
ii) They carry out vital metabolic functions, such as energy production
and nutrient processing.
iii) .Cells regulate the exchange of substances with their environment.
iv) .They possess genetic material that contains instructions for growth,
development, and reproduction such as DNA / RNA.
v).Cells can respond to stimuli and adapt to changes in their
surroundings.
vi).They have the ability to self-replicate, allowing for growth, repair,
and the development of multicellular organisms.
vii).They contribute to the formation and maintenance of tissues, organs,
and organ systems.

6. Types of Cell
There are two types of cell they
are:
i) Plant Cell
ii) Animal Cell

7. Plant Cell
Plant cells are rigid eukaryotic cells that form the
structural and functional building units of all
plants. A cell is like a machine and it has many parts.
The part that protects a cell in the plant is the cell
membrane. It is because it forms the covering of the
cell. There is one more layer to protect them because
plants cannot move. This is the cell wall. There are
many other parts in plant cell structure.

8. Animal Cell
An animal cell is a type of eukaryotic cell that has
no cell wall and has a true nucleus, bound by
membranes and other organelle cells. Animal cells
vary in size from a few microns to a few
millimeters. The largest known animal cell is the
ostrich egg, which can stretch more than 5.1
inches in diameter and weigh 1.4 pounds (1.4 kg).

9. Structure of Cell
Parts of cell are mentioned
below:
i) Cell Wall
ii) Cell Membrane
iii) Cytoplasm
iv) Vacuole
v) Nucleus

10. Cell Wall
Cell Wall is a thick, strong and rigid protective
part of cell. It is also known as dead cell because
it is composed of dead cell called cellulose. It is
only found in plants.
Function of cell Wall are listed below:
1) It provides structure and strength in plants .
2) It helps to transfer substances from inner to
outer part of cell

11. Cell Membrane
It is located inside the cell wall of a plant cell. It is made up od protein and lipid.
Cell membrane is a living layer which is also called plasma membrane. It represents
the outer most layer of animal cells, wheras in plant cells it is found below the cell
wall. It is a semi permeable membrane (allows to pass a part of solution only). Its
Function are listed below:
1) It gives shape to cell.
2) It protects cell organells.
3) It permits of wanted material whereas it exit of unwanted material.
4) The cell membrane acts as a physical barrier, separating the cell's internal
environment from the external environment and protecting it from
potentially harmful substances.

12. Cytoplasm
Cytoplasm is the gelatinous liquid that
fills the inside of a cell. It is composed
of water, salts, and various organic
molecules. It contains many cell
organnels. Different cell organnels
contain different function.

13. Ribosome
Ribsome are small and round in shape. Ribosomes
are small structures found in cells that play a crucial
role in protein synthesis. Ribosomes can be found in
large numbers within cells because proteins are vital
for many cellular functions. Proteins produced by
ribosomes are used for various purposes, such as
building cellular structures, acting as enzymes, and
serving as signaling molecules. Its function are:
1) It is the site of protein synthesis in the
cell. Etc…

14. Golgi Body
It manufacture protein, sugar and enzymes
and function include the storage. It is a cell
organelle that helps process and package
proteins and lipid molecules, especially
proteins destined to be exported from the
cell. Its function are listed below:
1) It transport, sorting and modification of
both protein and lipid Etc…….

15. Lysosomes
They are the kind of waste disposal system of cell.
It is also a membrane-bound with cell organelle
that contains digestive enzymes. Function of
lysosomes are listed below:
• Removal of dead cells
•Help in protein synthesis. ETC….

16. Mitochondria
Mitochondria are small and big both in
size. It takes part in cellular
respiration. The energy required for
various chemical activities needed for
life is released from mitochondria. It is
also known as power house of the cell.
Function of mitochondria are listed
below:
1) It generates energy
2) It stores power ETC…..

17. Centrosome
Centrosome is found only in animal
cell. It is located close to the
nucleus. It has centrioloes in it.
Centrosome play an important role
in formation of new cell in animal
cell. Function of centrosome are
listed below:
1) It helps in Cell Division ETC
…..