Year 8 Cell and Organisation - Revision 2014
Name: Mr. Hung Form: _________
Words: function, respiratory, multicellular, cells, level, circulatory, tissues, nervous system
1.
The Human Body is very complex. The Human Body, as a multicellular organism, is
composed of several level of organization that include cells, tissues, organs and organ systems.
2.
Each smaller level combines together to make the next level.
3.
Cells are the building blocks of all living things.
4.
A tissue is a group of similar cells that perform the same function .
5.
Organs are groups of different tissues with a specific function.
6.
Finally, organ systems are groups of organs that work together to perform a specific
job. Give 3 systems in our body: respiratory, circulatory and
nervous systems.
7.
The Human Body is made up of many systems that work together to perform complex tasks
on a daily basis.
8.
Arrange the 6 different levels of organisation of human body:
tissue, cell, organ, organism, organelle, organ system
organelle  cell  tissue  organ  organ system  organism
9.
Match the following organelles with their role in a cell.
Choice
Cell Wall
Function
Stores water in plants
The correct structure:
Cell Membrane
Jelly-like substance where chemical
reactions happen
Cytoplasm
Cytoplasm
Structures found in living cells
Nucleus
Gives energy to a cell
Organelles
Mitochondrion
Vacuole
A skin that lets substances into and
out of a cell
Cell membrane
Mitochondria
Barrier of a plant cell
Cell wall
Chloroplasts
Control centre of cell, where cell
division starts (mitosis)
Nucleus
Organelles
Makes own food using
Photosynthesis
Chloroplast
Vacuole
10.
Why are cells important? (Check the Internet for answers if needed)
They are the basic building blocks or units of multicellular organisms;
Cells can be specialised to perform different functions;
Different cells can be organised to tissues, organs and systems.
11.
12.
Give three differences between an animal cell and a plant cell.
A plant cell has extra structures: large vacuole, cell wall and chloroplasts
which are not found in an animal cell.
13.
What is the difference between a unicellular and multicellular organism?
A unicellular organism is made of one cell but a multicellular organism is
made up millions to trillions of cells. A multicellular organism is usually
larger however a unicellular can’t be seen unless using a microscope.
14. Label the microscope
Eyepiece
Coarse Focus
Adjustment
Fine Focus
Adjustment
Arm
Stage
Base
Mirror
Body tube
Nose piece
Objective
Stage clip
Diaphragm
Mirror
15.
What do the following parts of a microscope do?




Stage - to place the microscopic slide
Diaphragm- to adjust different amount of light from below
Objective Lenses- to magnify the image to different degrees
Mirror- to reflect light upward to the microscopic slide
16.
When you see an image under a microscope what happens to the image:
(Draw the image of a letter “F”)
a.
It stays the same
b.
It becomes a mirror image
c.
It looks upside down – left to right
d.
It is a mirror image and is also upside down
17.
Fill in the magnification of a microscope:
eyepiece
Objective lens
X 10
X 10
X 10
X5
X 10
X 80
18.
magnification
100X
50X
800X
Give 2 differences between Light Microscope (LM)and Dissecting Microscope (DM)




A LM consists of one eyepiece compared to 2 in a DM
A LM has light shining upward compared to downward in DM
A LM has a higher magnification than that of a DM
A LM gives a 2 dimensional image but it is a 3 dimensional image in a DM
 A LM requires the use of microscopic slide to prepare the sample and the
sample must be very thin and transparent; but the sample can be bigger or
thicker and need not to be transparent when viewing under the DM.
19. What are the steps to preparing an onion cell?
(1) Peel off the skin (epidermis) from an onion leaf
(2) Place the sample to a microscopic slide
(3) Add a drop of water / dye to the sample
(4) Cover the slide with a coverslip
20.
Our body is made up of many specialised cells, what do the following cells do in our body:




Red blood cell – for transporting oxygen from lungs to other cells
Fat cells – for storage of fat
Nerve cells – for passing nerve messages for action
Muscle cells – for contraction and relaxation to move.
21.
Which is the only cell in our body that doesn’t have a nucleus?
RED BLOOD CELLS
22.
What is a tissue? Give 3 examples
A group of similar cells that perform a particular function.
Blood, fat, nerve, muscle
23.
Why are tendons and ligaments in our body called connective tissue?
Tendons are connective tissues that join muscles to bones
Ligaments are connective tissues that join bones to bones
24.
What is an organ made up of?
a.
The building block of all living things
b.
At least two different types of tissues
c.
d.
Two or more different organs that work together
A group of cells that do the same thing in the body
25.
What is mitosis?
It is a cell division in which the daughter cells have exactly the same
genetic materials as their parent cells.
26.
What structure/chemical makes the mitosis possible?
Chromosomes and DNA
27.
Arrange different stages of mitosis in the correct sequence.
CBEAD