BIOLOGY REVISION SHEET FINAL EXAM TERM-I GRADE 9 Academic Year: 2020 - 2021 Note: The students should first study from their textbook and then try to solve this revision sheet independently Materials included in the FINAL exam: Chapter 3 Sections: 1,2,3,4 & 5 Textbook Pages: 70-91 Student Name: ………………………………………………………..
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BIOLOGY
REVISION SHEET
FINAL EXAM
TERM-I
GRADE 9
Academic Year: 2020 - 2021
Note: The students should first study from their textbook and then try to solve this revision sheet independently
Materials included in the FINAL exam:
Chapter 3
Sections: 1,2,3,4 & 5
Textbook Pages: 70-91
Student Name: ………………………………………………………..
SECTION 3.1
Q.1: Match each scientist in the table with the statement listed below that describes what
he did to help develop the cell theory.
a. concluded that animals and, in fact, all living things are made of cells.
b. was the first to identify cells and name them.
c. proposed that all cells come from other cells.
d. concluded that plants are made of cells.
e. observed live cells and observed greater detail.
Q.2: Compare between Eukaryotic and Prokaryotic cells:
h. So, The higher the concentration of dissolved particles in a solution, the
______________ the concentration of water molecules in that solution.
Q.3: Complete the Y diagram below to compare and contrast the processes of endocytosis
and exocytosis. Under the heading “endocytosis,” list the characteristics of endocytosis.
Under the heading “exocytosis,” list the characteristics of exocytosis. At the bottom of the Y,
write the characteristics that both processes have in common. Then lightly cross out those
characteristics at the top of the Y.
Endocytosis
Exocytosis
Both
Answer Key
SECTION 3.1
Q.1: Match each scientist in the table with the statement listed below that describes what
he did to help develop the cell theory.
Q.2: Compare between Eukaryotic and Prokaryotic cells:
Eukaryotic Cells Prokaryotic Cells
Nucleus ×
Membrane-bond organelles ×
Place of DNA Nucleus Cytoplasm
Cell type Animal and
plant cell
Bacteria
Q.3: What are the three parts of the cell theory?
ALL ORGANISMS ARE MADE OF CELLS.
ALL EXISTING CELLS ARE PRODUCED BY OTHER LIVING CELLS.
THE CELL IS THE MOST BASIC UNIT OF LIFE
Scientist Letter of Statement that Completes the Sentence
1. Hooke B
2. Leeuwenhoek E
3. Schleiden D
4. Schwann A
5. Virchow C
SECTION 3.2
Q.1: Write the function of each cell organelles and describe its structure:
1) Nucleus
The nucleus is a large structure
inside the cell. It Controls activities
in the cell and reproduction of the
cell. It’s center
Contains deoxyribonucleic acid or
DNA, which determines traits that
are passed on to new generations
when a cell reproduces.
2) Endoplasmic Reticulum
The Endoplasmic Reticulum consists
of folded membranes that act as
channels to transport proteins and
Other materials through the
cytoplasm.
3) Vacuole
Structures that temporarily store
water, other substances, and wastes
in cells. Vacuoles in plant cells are
usually much larger than those in
animal cells.
4) Cytoplasm
The cytoplasm is a gel-like fluid
inside the cell. It contains water,
other substances, and all the cell
organelles.
5) Golgi Apparatus
receives proteins from the
endoplasmic reticulum, sorts them,
Modifies some of them, and
packages them into little bag-like
structures called vesicles, which
break off of the structure and go into
the cytoplasm.
6) Lysosomes
Lysosomes contain digestive
chemicals like enzymes, which break
down and recycle worn-out
organelles.
7) Cell membrane
A layer that protects and surrounds
cells. It controls substances that flow
in and out of the cell.
8) Ribosomes
Ribosomes are organelles that
assemble or produce molecules
called proteins in the cell.
9) Cytoskeleton
The cytoskeleton is a structure that
helps cells maintain their shape and
internal organization, and it also
provides mechanical support that
enables cells to carry out essential
functions like division
and movement
10) Vesicles
Membrane covered structures that
carry proteins, water, and Nutrients
around the cell and even in and out of
the cell.
11) Mitochondria
In this organelle, the cell produces
energy using the process of cellular
respiration: glucose + oxygen 🡪
carbon dioxide + water + energy
12) Cell Wall
A cell wall is a tough layer outside the
cell membrane. It can be rigid, which
helps a plant hold its shape. It also
protects the inside of the cell.
13) Chloroplasts
In chloroplasts, the process of
photosynthesis is carried out.
Photosynthesis uses energy from the
sun to convert carbon dioxide and
water into sugar and oxygen. In this
way, plant cells produce food.
Q.2: Answer the following questions:
a) What characteristics are shared by most cells?
Most cells have membrane bound organelles and a nucleus. Most cells contain cytoplasm, are enclosed by a membrane, and have a nucleus. Most cells are microscopic, enclosed by a membrane, and contain cytoplasm.
b) What are the main differences between animal and plant cell?
A plant cell contains a large, singular vacuole that is used for storage and maintaining
the shape of the cell.
In contrast, animal cells have many, smaller vacuoles.
Plant cells have a cell wall, as well as a cell membrane. ... Animal cells simply have a cell membrane, but no cell wall
c) What similarities do mitochondria and chloroplasts share?
Chloroplasts, like mitochondria, produce energy for plant cells.
Both mitochondria and chloroplasts have their own circular DNA and can function independently of the eukaryotic host cell
d) What is the difference between a cell wall and a cell membrane?
Cell membrane helps to enclose the cell organelles and cytosol inside a cell. A cell wall is a ridged, protective layer and it covers the cell membrane.
For plants, cell walls are mainly made up of cellulose, while a cell wall in bacteria is made up of peptidoglycan, and for fungi it is made up of chitin.
SECTION 3.3 MAIN IDEA: Cell membranes are composed of two phospholipid layers.
Q.1: Draw a phospholipid in the box below. Label the three major parts.
2. Which part of a phospholipid is charged, or polar?