CLASS TEST
GRADE 11
LIFE SCIENCES: CHAPTERS 5, 6 AND 7
Test 3: Bacteria, viruses, fungi and protista
MARKS: 45
TIME: 1 hour
INSTRUCTIONS AND INFORMATION
1. Answer ALL the questions.
2. Number the answers correctly according to the numbering system used in this
question paper.
3. ALL drawings should be done in pencil and labelled in blue or black ink.
4. The diagrams in this question paper may NOT necessarily be drawn to scale.
SECTION A
QUESTION 1
1.1
Choose the correct answer to each question below. Write only the letter (A–D)
next to the question number (1.1.1–1.1.3) for example 1.1.4 C.
1.1.1 The flow chart below shows the possible fate of nitrates that have been added
to soil fertiliser.
Nitrates
Runoff into lakes and
rivers
Absorbed by plants
Converted into nitrogen
gas
The bacteria that convert nitrates into nitrogen gas are called ...
A
nitrifying bacteria.
B
denitrifying bacteria.
C
nitrogen-fixing bacteria.
D
nitrate bacteria.
1.1.2 Which of the following is a disease NOT caused by bacteria?
A
Anthrax
B
Tuberculosis
C
Fire blight
D
Malaria
1.1.3 An organism that reproduces by means of binary fission is a/an ...
A
amoeba
B
yeast
C
human immunodeficiency virus (HIV)
D
influenza virus
(3 × 2)
1.2
(6)
Give the correct biological term for each of the following descriptions.
Write only the term next to the question number (1.2.1–1.2.4).
1.2.1 An organism that carries a disease without being affected by it.
1.2.2 The disease caused by a protist that attacks the large intestine causing
cysts, ulcers and bleeding.
1.2.3 The ‘false feet’ of amoeba that are used for movement.
1.2.4 An algal bloom of dinoflagellates that causes poisoning of shell fish.
Maskew Miller Longman, Focus on Life Sciences – Test 3: Bacteria, viruses, fungi and protista
(4)
1.3
Biologists have found it difficult to classify this organism as a plant or an
animal, so it is now placed within its own category. Study the diagram
carefully and answer the questions.
1.3.1 Name this organism.
(1)
1.3.2 Write down:
a)
ONE visible plant-like characteristic.
(1)
b)
THREE visible animal-like characteristics.
(3)
TOTAL SECTION A: 15
Maskew Miller Longman, Focus on Life Sciences – Test 3: Bacteria, viruses, fungi and protista
SECTION B
QUESTION 2
Draw and label a scientific diagram to show the structure of a bacterium.
[5]
QUESTION 3
Weakened viruses are used in vaccinations. The diagram shows two of the same
type of virus. One is normal and the other one has been weakened. Study them
carefully and answer the questions.
3.1
How is the weakened virus structurally different from the normal virus?
(1)
3.2
Explain how this structural difference may have a negative effect on the
life cycle of the weakened virus.
(3)
Describe how the antigens of the weakened virus help a person to gain
immunity from the disease.
(3)
3.4
Why is this form of vaccination said to be artificial and active?
(2)
3.5
Which deadly disease was the first vaccination developed to combat in
the 1700s?
(1)
3.3
3.6
Name the scientist who first discovered the principle of vaccination.
(1)
[11]
QUESTION 4
The west coast is the centre of South Africa’s fishing industry. Discuss the role of
phytoplankton along this coast.
[4]
Maskew Miller Longman, Focus on Life Sciences – Test 3: Bacteria, viruses, fungi and protista
QUESTION 5
Mushrooms are a healthy food option because they contain few calories, have no
cholesterol and are fat- and salt-free. Mushrooms are also packed with healthy
minerals and vitamins.
5.1
Give TWO ways in which mushrooms differ from true plants.
(2)
5.2
In which other ways are fungi used in food production?
(2)
5.3
Fungi are not only useful to people but can also be pathogens. Name ONE
human disease caused by fungi.
(1)
[5]
TOTAL SECTION B: 25
GRAND TOTAL: 40
Maskew Miller Longman, Focus on Life Sciences – Test 3: Bacteria, viruses, fungi and protista