Download Homework Exercise 1 - Cells, Tissues and Organs 1. Place the

Multicellular Organisms
Homework 1
Homework Exercise 1 - Cells, Tissues and Organs
1. Place the following structures in order of increasing complexity starting
with Cells:
Organs, Tissues, Systems, Cells
Cells
__________
_________
__________
(1)
2. The diagrams below show examples of some types of specialised
cells from the human body.
The cells are not drawn to the same scale.
(μm = micrometre)
(a) Put letters in the boxes below to arrange the cells in order of
increasing size
(1)
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Multicellular Organisms
Homework 1
(b) Choose one of the following cell types
sperm cell OR egg cell OR red blood cell
Describe the function of the chosen cell and explain how its specialisation
allows it to carry out that function.
(1)
3. Below are some job vacancies for specialised cells. From the following list
of cells, state which cells would be suitable for each job numbered 1- 5.
List of specialised cells: cheek cell, red blood cell, muscle cell,
leaf palisade cell, sperm cell, liver cell, nerve cell, epidermal cell,
root hair cell, cortex cell, heart cell, bone cell
Job Vacancies for Specialised Cells
Urgently required
Wanted
This post would suit a biconcave
disc shaped cell which must be
flexible enough to pass through
capillaries.
Required to transport oxygen from
the lungs to body cells. No nucleus
required.
Reply to job number 2
Specialised cell with
tail required. Must be
able to swim and fuse
with the nucleus of an
egg cell.
Reply to job number 1
Experienced Cell
Must be able to work in the dark as these cells are required to
work underground. Must have a large surface area and be able
to absorb water and mineral salts.
Reply to job umber 3
Good Communication Skills
The successful cell must be
qualified to send electrical
signals. If required, must be
able to cover long distances.
Reply to job number 4
Day time hours
Cells required to work
outdoors or indoors. Only
cells containing chloroplasts
will be considered for the
job. The successful applicant
must like working in sunlight.
Reply to job number 5
Answer
Job
number
1
2
3
Specialised
Cell
Job
number
4
5
2
Specialised
Cell
(5)
Multicellular Organisms
Homework 1
4. Blood is an example of a tissue.
(i) Describe what is meant by a tissue.
(1)
5. Read the following passage and answer the questions which follow.
A human body is made up of small building blocks called cells. Muscle cells and
nerve cells are two of many types of cells found in the body. These cells are
specialised i.e. they have a specific structure to allow them to do a specific task
in the body e.g. red blood cells contain haemoglobin to help them carry oxygen
around the body.
Cells can be grouped together. A group of cells of the same type is called a
tissue, therefore a group of muscle cells is called muscle tissue and a group of
nerve cells is called nerve tissue.
An organ is a part of the body with a particular job to do. For example the
heart pumps blood and the stomach helps digest food. Each organ is made from
a few very different tissues i.e the stomach contains both muscle and nerve
tissue.
More than one organ is needed to digest food. The stomach does some of the
work but the mouth containing teeth and salivary glands and the intestines are
other organs which help. The stomach and intestines form the digestive system,
the heart and blood vessels form the circulatory system and they work
together to circulate blood around the body.
(a) What term is given to a living organism that consists of more than one cell?
(1)
(b) Most of these cells are specialised. What does this term mean?
(1)
(c) Using information from the passage, name 2 types of tissue.
(2)
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Multicellular Organisms
Homework 1
6(a) The following statement refers to organs. Rewrite the statement to
make it correct by selecting the correct term from the choices given.
cell
An organ is composed of several different
tissues
working
systems
together to carry out a particular job.
(b) State which two of the following are NOT organs
Heart, leaf, cheek cell, stomach, root, brain, lung, onion cell
(2)
7. The following diagrams show systems found in animals and plants
Circulatory system
Leaf canopy
Image from BBC Bitesize
Respiratory system
Image from BBC Bitesize
Define the term system.
(1)
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