Download cell - Nozha Language Schools

Unit One
Lesson No. 3
The cell
The cell : is the building unit of the living organism body.
.
The cell performs the biological functions such as nutrition, respiration,
excretion and reproduction.
Living organism may be animals or plants.
Structure of the cell :
Cell parts
Animal
Plant
Nucleus
√
√
Cytoplasm
√
√
Plasma membrane
√
√
Cell wall
x
√
Chloroplasts
x
√
vacuole
√
√
• Nucleus : dark oval body
Function : It has a big role
in cell division.
• Cytoplasm : fill the space
of the cell.
Function:
Biological
operations are acted by it.
• Plasma membrane : surrounds the cell.
Function : controls the substances entering into the cell or leaving it..
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Unicellular organisms :
They are not seen by the naked eye.
Examples : Bacteria and Yeast.
They can do all biological functions.
Yeast fungus (unicellular organism)
Economic importance of the
yeast fungus.
It is used in a lot of industries
such as :
1- Making bread.
2- Making alcohol
Structure of Yeast fungus
2
Exercises
1- Choose the correct answer :
1- Which of the following can be existed in a plant cell and can not existed in
an animal cell?
(Nucleus – chloroplast – cytoplasm – cell membrane)
2- The ………… is an example of unicellular living organisms.
(frog – snake – yeast fungus – a bean plant)
3- All the following are properties of living organisms except ……….
(motion – sensation – nutrition – magnetism)
4- All the following can be found in yeast fungus except …….
(cytoplasm – chloroplast – nucleus – cell wall)
5- The building unit in the body of the living organism is the ………………..
(cell – tissue – organ – system)
6- In both animal and plant cells the ……….. exists.
( nucleus – cell wall – chloroplast)
7- A group of tissues make up ……………..
(a cell – an organ – a system a body)
8- The group of similar cells that do the same function is called ………….
(an organ – a tissue – a system – a cell wall)
9- The system in the human body is composed of a group of ………….
(organs – tissues – different cells – similar cells)
10- The yeast fungus is used in a lot of industries such as ……….
(making clothes – making bread – making papers – making soda)
11- Which of the following is considered as an organ ………… ?
(yeast fungus – heart – epidermis of onion plant – bean plant)
12- A tissue is …………..
( a group of organs – a group of systems – a group of different cells in
structure and function – a group of similar cells in structure and
function).
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2- Complete the following statements :
1234-
Living organisms are classified into unicellular and multi cellular
The human body consists of small building units called the cell
Each living cell has an oval shaped body which is called nucleus
The fluid in which all the cell components are suspended is called the
cytoplasm
5- The cytoplasm is surrounded by cell membrane
6- The chloroplast exists in the plant cells.
7- The cell wall characterizes the plant cell than the animal call.
8- The plant cells are characterized by the presence of cell wall and
chloroplast
9- A tissue is composed of many similar cells
10- Tissues join together to make an organ
11- Examples of unicellular organisms are fungus and amoeba
12- The yeast fungus can not be seen by naked eye.
13- The economic importance of the yeast fungus is making bread and making
alcohol
14- The living organism body is made up of systems integrated with each other
and every system is made up of organs Containing tissues each of them
has its own function.
3- Write Scientific term
1- The building unit of the living organism.
(cell )
2- A dark oval body inside the cytoplasm of the living cell. ( nucleus )
3- A gelatinous liquid that Surrounds the nucleus of the living cell and contain
some structures. ( cytoplasm )
4- A vacuole in the plant cell. ( sap vacuole )
5- A group of organs that work together. ( systems )
6- A unicellular organism used in making bread and alcohol.( yeast fungus )
7- Small organelles that spread in the cytoplasm of the plant cells and make
photosynthesis process. (chloroplast )
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4- G.R.F
1- Cells of leaves in plants have a green colour.
Because it contains chloroplast .
2- The heart is considered an organ.
Because it consists of different tissues
5- Put (√ ) or (x)
1- The plant cell is surrounded by a cell wall
(
√
2- Chloroplasts exist in both animal and plant cells
(
3- The living cells contain cytoplasm
(
4- All body cells are similar in shape.
(
x
)
√
5- The system is a group of tissues working together.
6- The yeast fungus is a multi cellular organism.
)
)
x
(
x
(
)
)
x
)
6- Compare the structure of the plant cell, animal cell and yeast
fungus in the opposite table
Comparison
Plant cell
Nucleus
Cytoplasm
Chloroplast
Animal cell
√
√
√
√
√
x
Yeast fungus
√
√
x
7- Give an example to each of the following
1- A unicellular organism yeast fungus
2- An organ related to the digestive system in the human body stomach
3- A system that carries out the transport function in the human body.
Circulatory system
8- What happens in each of the following cases :
1- The absence of chloroplasts from the corn plant cell.
Doesn't perform the photosynthesis process.
2- The absence of nucleus from the animal cell.
The biological operations do not be organized.
3- The absence of plasma membrane from the animal cell.
Entering or leaving substances don't be controlled.
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