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Course: Alhussan Biology — Stage 7
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Alhussan Biology — Stage 7

Chapter 1: Classification and Life

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Chapter 2: Cells and Organisation

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Chapter 3: Microorganisms and Decomposers

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Chapter 4: The Physical Environment and Water Cycle

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Quiz

1.2 Investigating living organisms: yeast — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Height of the bubble layer on a yeast mixture over time. Between which two values of "Time (min)" did "Bubble layer (mm)" change the most?
Dr Dabour Hub Academy - figure 1
15 and 20
10 and 15
0 and 5
5 and 10
2.
Gas collected from yeast with different masses of sugar at 35 °C. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
3.
Which statement is NOT correct?
One reading is enough for reliable results.
Yeast reproduces by budding.
Repeating readings and calculating a mean makes results more reliable.
The amount of sugar is kept the same; it is a control variable.
4.
Three readings of gas volume were 16, 17 and 14 cm³. What is the mean?
17.0 cm³
−2.0 cm³
15.7 cm³
47.0 cm³
5.
Dried yeast looks lifeless. What shows it is living when mixed with warm water and sugar?
It dissolves completely
It changes colour to brown
It becomes cold
It produces bubbles of carbon dioxide
6.
Which statement is correct?
Limewater turns blue with carbon dioxide.
Dried yeast is dead and can never become active.
A balloon over a test tube can collect the gas.
The gas volume is the independent variable.
7.
Which is the correct definition of “Dependent variable”?
The variable that is measured in an investigation.
A container sunk in the ground to catch walking invertebrates.
A key of paired statements, each leading to a name or another question.
A hard outer skeleton.
8.
Gas made by yeast with four different sugars. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
9.
Which statement is correct?
Yeast is a type of bacterium.
Limewater turns blue with carbon dioxide.
Counting bubbles is unreliable because bubbles do not come out steadily.
Cold temperatures make yeast respire faster.
10.
Gas collected from yeast with different masses of sugar at 35 °C. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 4
"Volume of gas (cm³)" rises to a peak at 8, then falls
"Volume of gas (cm³)" stays the same
"Volume of gas (cm³)" decreases as "Mass of sugar (g)" increases
"Volume of gas (cm³)" increases as "Mass of sugar (g)" increases
11.
Which term matches this definition? “A solution that turns cloudy when carbon dioxide passes through it.”
Classification
Limewater
DNA
Family
12.
Gas made by yeast in 10 minutes at different temperatures. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
13.
Which statement is NOT correct?
Yeast is used to make bread rise because of the carbon dioxide it makes.
Counting bubbles is the most reliable method.
Dried yeast becomes active when mixed with warm water and sugar.
On a graph, temperature goes on the x-axis.
14.
Which is the correct definition of “Yeast”?
A small round beetle, often red with black spots.
An arthropod with six legs and three body parts.
A microscopic single-celled fungus.
The largest classification group, such as plants or animals.
15.
Gas made by yeast rose from 5 cm³ to 30 cm³ when it was warmed. Calculate the percentage increase.
600%
83%
500%
25%
16.
Gas made by yeast with four different sugars. What is the value for Lactose?
Dr Dabour Hub Academy - figure 6
41
35
33
3
17.
A student counted organisms showing each life process. Which process did every organism show?
Dr Dabour Hub Academy - figure 7
Respiration
Speaking
Flying
Photosynthesis only
18.
Three readings of gas volume were 18, 13 and 14 cm³. What is the mean?
18.0 cm³
−4.0 cm³
45.0 cm³
15.0 cm³
19.
Height of the bubble layer on a yeast mixture over time. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
20.
Gas made by yeast rose from 8 cm³ to 15 cm³ when it was warmed. Calculate the percentage increase.
88%
7%
47%
188%
21.
A gas syringe collected 12 cm³ of gas in 3 minutes. What was the mean rate of gas production?
9.0 cm³/min
36.0 cm³/min
0.2 cm³/min
4.0 cm³/min
22.
Gas made by yeast in 10 minutes at different temperatures. Calculate the percentage change in "Volume of gas (cm³)" from 10 to 60.
Dr Dabour Hub Academy - figure 9
−300%
25%
75%
−75%
23.
Gas made by yeast in 10 minutes at different temperatures. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
24.
Gas made by yeast in 10 minutes at different temperatures. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 11
A
B
C
D
25.
In an investigation of how temperature affects yeast respiration, what is the independent variable?
The amount of sugar
The volume of gas produced
The temperature of the mixture
The size of the flask
26.
A gas syringe collected 36 cm³ of gas in 6 minutes. What was the mean rate of gas production?
30.0 cm³/min
6.0 cm³/min
216.0 cm³/min
0.2 cm³/min
27.
Which statement is correct?
Yeast is used to make bread rise because of the carbon dioxide it makes.
Dried yeast is dead and can never become active.
Yeast is a type of bacterium.
Cold temperatures make yeast respire faster.
28.
Which is the correct definition of “Fermentation”?
Respiration by yeast with little oxygen, giving ethanol and carbon dioxide.
The group below kingdom.
The list of choices made in a key, such as 1a, 2b, 3a.
A small round beetle, often red with black spots.
29.
Which statement is correct?
Yeast makes gas fastest at about 35 to 40 °C.
Limewater turns blue with carbon dioxide.
The gas volume is the independent variable.
One reading is enough for reliable results.
30.
Which statement is correct?
Living organisms vary, so an investigation using them is never completely fair.
Yeast reproduces by making seeds.
Yeast is a type of bacterium.
Dried yeast is dead and can never become active.
31.
Which term matches this definition? “The variable that is measured in an investigation.”
Kingdom
Reproduction
Dependent variable
Respiration
32.
Gas made by yeast with four different sugars. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 12
A
B
C
D
33.
Which is the correct definition of “Mean”?
The total of the readings divided by the number of readings.
A sea animal with stinging tentacles and no legs.
Respiration by yeast with little oxygen, giving ethanol and carbon dioxide.
The temperature at which a process works fastest.
34.
Which term matches this definition? “Respiration by yeast with little oxygen, giving ethanol and carbon dioxide.”
Fermentation
Growth
Insect
Phylum
35.
Which is the correct definition of “Fair test”?
An animal without a backbone.
An arthropod with eight legs and two body sections.
An investigation where only one variable is changed.
Chemical reactions in cells that release energy from food.
36.
Gas made by yeast with four different sugars. Which has the greatest value?
Dr Dabour Hub Academy - figure 13
Fructose
Sucrose
Glucose
Lactose
37.
Which statement is NOT correct?
In fermentation, glucose is turned into ethanol and carbon dioxide.
Yeast produces bubbles of carbon dioxide.
Yeast reproduces by making seeds.
Living organisms vary, so an investigation using them is never completely fair.
38.
Yeast is used to make bread rise because of the ____ it makes.
carbon dioxide
water
sugar
ethanol
39.
The amount of sugar is kept the same; it is a ____ variable.
independent
random
dependent
control
40.
Dried yeast becomes active when mixed with warm water and ____.
sugar
oil
sand
salt
41.
Wash your hands after handling ____.
yeast
water
glass
paper
42.
Yeast reproduces by ____.
splitting into four
spores only
seeds
budding
43.
On a graph, temperature goes on the ____.
key
x-axis
title
y-axis
44.
The volume of gas produced is the ____ variable.
dependent
fixed
independent
control
45.
True or false? Dried yeast is dead and can never become active.
True
False
46.
True or false? In the temperature investigation the independent variable is the temperature.
True
False
47.
True or false? At low temperatures the reactions in yeast are slow.
True
False
48.
True or false? Counting bubbles is the most reliable method.
True
False
49.
True or false? Above about 60 °C yeast is killed.
True
False
50.
True or false? Yeast fermentation produces oxygen.
True
False
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Part of Chapter 1: Classification and Life — see every lesson and quiz in this unit.
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