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Checkpoint Biology 0893

Grade 6 - Unit 1: Cells and organisms

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Grade 6 - Unit 4: Living organisms and classification

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Grade 6 - Unit 7: Microorganisms and food webs

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Grade 7 - Unit 1: Breathing and respiration

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Grade 7 - Unit 4: Ecosystems

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Grade 7 - Unit 7: Nutrition, health and movement

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Grade 8 - Unit 1: Cells and organisms

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Grade 8 - Unit 4: Living organisms and classification

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Grade 8 - Unit 7: Microorganisms and food webs

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Quiz

1.2 Gas Exchange

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Gas Exchange Checkpoint Biology quiz: free practice for Cambridge Checkpoint Biology 0893. Work through this Gas Exchange Checkpoint Biology quiz and get instant feedback on every answer. If you get stuck, review the 4.2 Gas exchange lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
Start Quiz
1.
Which statement correctly describes diffusion?
another name for an air sac in the lung
the movement of particles from where there are many of them to where there are fewer
a very tiny blood vessel, here wrapped tightly around an air sac
the substance in red blood cells that oxygen combines with
2.
Which statement correctly describes gas exchange?
another name for an air sac in the lung
the liquid part of the blood surrounding the blood cells
oxygen passing from the air into the blood while carbon dioxide passes from the blood into the air
the substance in red blood cells that oxygen combines with
3.
Gas exchange in the alveoli happens by:
Diffusion
Active transport
Osmosis
Filtration
4.
The diagram shows part of an alveolus beside a blood capillary, with four parts labelled A to D. Most of the carbon dioxide that blood brings to the lungs is carried dissolved in which labelled part?
Dr Dabour Hub Science Diagram and Course Material
Labelled part A
Labelled part B
Labelled part C
Labelled part D
5.
The particle diagram shows the air inside an alveolus and the blood in a capillary beside it at one instant. What will happen to the particles over the next second?
Dr Dabour Hub Science Diagram and Course Material
More oxygen moves right and more carbon dioxide moves left
Both gases move right, into the blood, since blood absorbs gases
No particles cross, because the wall between them is a solid barrier
More oxygen moves left, towards the side already rich in oxygen
6.
Faisal gently breathes in and out through the mouthpiece of this apparatus ten times. Which tube turns milky first, and why?
Dr Dabour Hub Science Diagram and Course Material
Tube A, because the air he breathes in bubbles through it and is richer in carbon dioxide
Both tubes at the same time, because exactly the same air passes through each of them
Tube B, because his exhaled air has less oxygen, and a lack of oxygen turns limewater milky
Tube B, because his exhaled air bubbles through it and has more carbon dioxide
7.
The graph shows the oxygen level in blood as it flows along a capillary beside an alveolus. Why does the line level off after about 0.3 mm?
Dr Dabour Hub Science Diagram and Course Material
The red blood cells have burst and cannot take in any more oxygen
The blood oxygen level now equals that in the alveolus, so net diffusion stops
The capillary wall becomes thicker further along and blocks the oxygen
Oxygen is being pumped back out of the blood as fast as it goes in
8.
Lina breathed out through fresh limewater after three different activities and timed how long it took to turn milky. Which conclusion is best supported by her results?
Dr Dabour Hub Science Diagram and Course Material
After more activity she breathed out carbon dioxide faster
Jogging made her breathe out less carbon dioxide, because its time was the shortest
Activity has no effect, because the limewater turned milky after every activity
Her breath at rest contained no carbon dioxide, since it took the longest time
9.
In the diagram, arrows 1 to 4 show four movements at an alveolus. Which arrow shows the movement that carries newly absorbed oxygen away, keeping the oxygen level in the blood beside the alveolus low?
Dr Dabour Hub Science Diagram and Course Material
Arrow number 1
Arrow number 2
Arrow number 4
Arrow number 3
10.
Samples P, Q and R are room air, Kofi's breath at rest and Kofi's breath just after running up the stairs, in some order. Which sample was breathed out just after the run?
Sample Q – it has the least oxygen and the most carbon dioxide
Sample R – its 3.5% carbon dioxide matches normal exhaled air
Sample P – it has the most oxygen still left for the muscles
Sample R – its oxygen level is the closest to the usual 16%
11.
Using the table, what percentage of the oxygen Mr Tan breathed in was absorbed into his blood while he was on the exercise bike?
About 6%
About 71%
About 29%
About 19%
12.
Which explanation best links the two columns of data in this survey?
Smokers breathe in less air, so less carbon monoxide gets into their lungs
Carbon monoxide adds extra oxygen to the blood, so smokers get tired later
Smoke makes the alveolus walls thinner, which slows diffusion into the blood
Carbon monoxide lowers how much oxygen the blood carries
13.
Amira used layers of jelly to model the wall between the air in an alveolus and the blood. What does her model suggest?
Thick walls are better for gas exchange because they can hold more gas inside them
Thin walls let gases cross fastest
Wall thickness makes no difference, because the dye crossed every layer in the end
Gases cross thicker walls faster, because there is more material for them to move in
14.
Which row of Group 4's table contains a conclusion that is NOT supported by their results?
Row 1 of the table
Row 2 of the table
Row 3 of the table
Row 4 of the table
15.
Priya wants to show that the air we breathe out contains more water vapour than the air in the room. Which plan would do this best?
Breathe out through limewater and see whether it turns milky
Breathe on one cold mirror, leave a second in room air, and compare
Breathe onto a warm mirror so that the mist appears more quickly
Hold a thermometer in the breath and compare it with room air
16.
Why do millions of tiny alveoli allow more gas exchange than one large air sac of the same total volume?
One large sac would have thinner walls than lots of small sacs
Each small sac holds more oxygen than a single large sac could
Tiny sacs make the air stay still so that it cannot be breathed out
Together they have a much larger surface area
17.
Imagine blood suddenly stopped flowing through the capillaries around one alveolus. What would happen to gas exchange there?
It would slow down and then stop
It would speed up, because still blood has longer to collect oxygen
Oxygen would start to diffuse out of the blood back into the air
Carbon dioxide would start to diffuse from the air into the blood
18.
Why is the inner surface of each alveolus covered with a thin film of moisture?
It traps dust and microorganisms before they reach the blood
It cools the incoming air so that more oxygen can fit inside
Gases dissolve in it before they diffuse across
It seals the wall so that no gases can leak out of the lungs
19.
Carbon dioxide diffuses out of the blood into the alveoli. Which statement explains why?
The walls of the lungs actively pump it out of the capillaries
Blood reaching the lungs has more carbon dioxide than the air
Oxygen entering the red blood cells pushes it out of the blood
Air in the alveoli contains more carbon dioxide than the blood
20.
A doctor gives Mrs Osei, whose alveoli are damaged, air containing 40% oxygen to breathe. Which is the best reason why this helps her?
It repairs the broken walls between her alveoli so they can work again
It makes her capillary walls thicker so that they hold more oxygen
It stops her body cells making any carbon dioxide for a while
It makes a steeper oxygen gradient into the blood
21.
Each option pairs an adaptation of the alveoli with how it helps gas exchange. Which pairing is correct?
Moist lining – traps dust and microbes from the air
Thin walls – short distance for gases to diffuse
Good blood supply – makes the alveolus walls stronger
Large surface area – slows the air so it can warm up
22.
Each option pairs a substance with a test and a positive result. Which pairing is correct?
Water vapour – limewater – turns milky
Oxygen – cold mirror – mist forms
Carbon dioxide – thermometer – reading rises
Carbon dioxide – limewater – turns milky
23.
Each option pairs a substance in cigarette smoke with its effect. Which pairing is correct?
Tar – damages cilia and can cause cancer
Nicotine – makes the alveoli surface area larger
Carbon monoxide – makes the cilia beat faster
Tar – increases the oxygen carried in the blood
24.
Each option pairs a difference between inhaled and exhaled air with a reason. Which pairing is correct?
Carbon dioxide rises to 4% – it is made in the alveoli
Water vapour rises – it is made by the cilia in the airways
Oxygen falls from 21% to 16% – used in respiration
Nitrogen stays at 78% – it is used up and replaced equally
25.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 1
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 1
A
B
C
D
26.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 4
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 4
A
B
C
D
27.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 5
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 5
A
B
C
D
28.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 8
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 8
A
B
C
D
29.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 15
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 15
A
B
C
D
30.
A class will look at a pair of sheep lungs from a butcher. Which precaution is most important?
Blow into the trachea with your mouth
Keep the lungs warm in an oven first
Wear gloves and wash hands well afterwards
Taste a small piece to check it is fresh
31.
Which term is described as: the blood cell that carries oxygen, using haemoglobin?
haemoglobin
diffusion
red blood cell
blood plasma
32.
Which term is described as: another name for an air sac in the lung?
alveolus
red blood cell
haemoglobin
gas exchange
33.
The many capillaries around the alveoli carry oxygen away quickly, keeping a steep _____ between the air and the blood.
concentration gradient
layer of cartilage
supply of sticky mucus
pressure of the muscles
34.
Inhaled air contains about 0.04% carbon dioxide, and exhaled air contains about _____, which is roughly 100 times as much.
0.4% carbon dioxide
40% carbon dioxide
4% carbon dioxide
16% carbon dioxide
35.
Oxygen diffuses across two thin layers to reach the blood: the alveolus wall and the _____.
cartilage ring
diaphragm muscle
bronchiole lining
capillary wall
36.
In gas exchange, oxygen goes from the blood into the air. - True or false?
True
False
37.
Air sacs are also called alveoli. - True or false?
True
False
38.
In gas exchange, oxygen goes from the air into the blood. - True or false?
True
False
39.
A blood capillary is separated from each alveolus by a thick layer of muscle. - True or false?
True
False
40.
When oxygen gets into the blood it stays as bubbles in the plasma. - True or false?
True
False
41.
The drawings show lung tissue from two people. Statement: tissue Y comes from a person with emphysema and has a smaller surface area for gas exchange than tissue X. True or false?
Dr Dabour Hub Science Diagram and Course Material
False – larger air spaces give tissue Y a larger surface area
False – tissue X is the damaged one because it is more crowded
True – its alveolus walls have broken down into fewer, larger spaces
True, but only because each air space in Y holds less air
42.
Statement: sample K is blood that has just left the alveoli. True or false?
False – blood leaving the alveoli is like J
True – K has more carbon dioxide, which it picked up from the air in the alveoli
True – blood leaving the lungs has already used up most of its oxygen there
False – blood leaving the alveoli has lost oxygen and gained carbon dioxide
43.
Nitrogen makes up about 78% of both inhaled and exhaled air. True or false?
True – the body does not use nitrogen
False – most nitrogen is absorbed into the blood in the alveoli
False – exhaled air contains no nitrogen, only carbon dioxide
True, but only when the person is breathing hard after exercise
44.
Exhaled air has more carbon dioxide than inhaled air because the alveoli make carbon dioxide. True or false?
True – the alveoli turn some of the oxygen into carbon dioxide
False – it is made by respiration in body cells
True – that is the reason the alveolus walls are so thin
False – exhaled air contains less carbon dioxide than inhaled air
45.
In the alveoli, oxygen and carbon dioxide diffuse in opposite directions at the same time. True or false?
False – oxygen must finish entering before carbon dioxide can leave
False – both gases move into the blood together in the same direction
True – each gas moves down its own gradient
True, but only during the moment when a person is breathing in
46.
Air breathed out is warmer than air breathed in because it has been warmed by the body. True or false?
False – exhaled air is colder because oxygen has been removed from it
False – inhaled and exhaled air are always at the same temperature
True, but only for people who live in very cold countries
True – it is warmed towards 37 °C
47.
Zara claims that having more alveoli, each with thicker walls, would make gas exchange better. True or false?
False – thicker walls slow diffusion
True – more alveoli always means faster gas exchange, whatever the walls
True – thicker walls would stop the alveoli from bursting or leaking
False – having more alveoli would reduce the lungs' surface area
48.
Oxygen diffuses into the blood faster when the blood arriving at the lungs contains very little oxygen. True or false?
False – blood with little oxygen is too weak to take in more
False – the speed depends only on how fast the person breathes
True – the concentration difference is bigger
True, but only if the blood contains no carbon dioxide at all
49.
Breathing onto a cold window makes it mist up because exhaled air contains carbon dioxide. True or false?
True – carbon dioxide turns into tiny droplets when it is cooled
False – the mist is condensed water vapour
True – the mist shows that exhaled air is warmer than the window
False – exhaled air contains less water vapour than room air
50.
Gas exchange also happens in the trachea and bronchi, because these tubes carry air. True or false?
True – any tube that carries air can exchange oxygen with the blood
True – the trachea takes in most of the oxygen before the lungs
False – gas exchange happens only in the nose and mouth
False – it happens only in the alveoli
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Part of Grade 7 - Unit 1: Breathing and respiration — see every lesson and quiz in this unit.
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