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Course: Edexcel Modular - OL
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Edexcel Modular - OL

1. The Nature and Variety of Living Organisms

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2. Structures and Functions in Living Organisms

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3. Reproduction and Inheritance

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4. Ecology and the Environment

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5. Use of Biological Resources

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Quiz

Gas Exchange (Unit 1) – Check yourself

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Gas Exchange Edexcel O Level Modular Biology check yourself quiz: free practice for Edexcel Modular – OL. Work through this Gas Exchange Edexcel O Level Modular Biology check yourself quiz and get instant feedback on every answer. If you get stuck, review the 2.7 Gas exchange — Notes lesson. More practice: Edexcel Modular – OL — all units. Syllabus: Pearson Edexcel International GCSEs.

  • Questions count: 10
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
What colour does hydrogencarbonate indicator turn when CO2 concentration increases?
Purple
Yellow
Red
Blue
2.
During inhalation the diaphragm:
Relaxes and domes upward
Contracts and domes upward
Relaxes and flattens
Contracts and flattens
3.
A plant in darkness will:
Take in O2 and release CO2
Take in CO2 and release O2
Carry out no gas exchange
Only release O2
4.
Which substance in cigarette smoke reduces the oxygen-carrying capacity of blood?
Tar
Nicotine
Carbon monoxide
Mucus
5.
Which is NOT an adaptation of alveoli?
Walls one cell thick
Rich blood supply
Large surface area
Thick cartilage rings
6.
Why are most stomata on the lower surface of a leaf?
To reduce water loss
To absorb more light
To store starch
To support the leaf
7.
Which statement best describes Diaphragm?
An indicator that changes colour with CO2 concentration: yellow (high), red (atmospheric), purple (low).
A sheet of muscle below the lungs that contracts and flattens during inhalation.
Loosely packed leaf cells with large air spaces that allow gases to diffuse through the leaf.
A tiny air sac in the lungs where gas exchange with the blood takes place.
8.
Which statement best describes Hydrogencarbonate indicator?
An indicator that changes colour with CO2 concentration: yellow (high), red (atmospheric), purple (low).
A pore, usually on the underside of a leaf, controlled by two guard cells, which lets gases in and out.
The light intensity at which the rate of photosynthesis equals the rate of respiration, so there is no net gas exchange.
A tiny air sac in the lungs where gas exchange with the blood takes place.
9.
Which statement best describes Alveolus?
A lung disease in which alveolar walls break down, reducing surface area for gas exchange.
A tiny air sac in the lungs where gas exchange with the blood takes place.
The light intensity at which the rate of photosynthesis equals the rate of respiration, so there is no net gas exchange.
The movement of oxygen and carbon dioxide between an organism and its environment by diffusion.
10.
Which statement best describes Intercostal muscles?
A tiny air sac in the lungs where gas exchange with the blood takes place.
A sheet of muscle below the lungs that contracts and flattens during inhalation.
Muscles between the ribs that move the rib cage during breathing.
A lung disease in which alveolar walls break down, reducing surface area for gas exchange.
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Part of 2. Structures and Functions in Living Organisms — see every lesson and quiz in this unit.
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