IGCSEBiology: Co-ordinated Sciences (Double Award)CIETopic Questions11. Gas Exchange in HumansGas Exchange in Humans

Gas Exchange in Humans (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))

Topic Questions

DownloadView
Easy
Medium
Hard
Easy
Medium
Hard
1
Sme Calculator1 mark

Extended Tier Only

What makes the alveoli suitable as a gas exchange surface in mammals?

 

a dense capillary network

large total surface area
A

X

X
B

✔

X
C

X

✔
D

✔

✔

    Choose your answer

    Did this page help you?

    2
    Sme Calculator    1 mark

    Which of the following sequences show the correct path of oxygen as it enters the lungs?

    • trachea → bronchiole → bronchus → alveolus

    • trachea → bronchus → bronchiole → alveolus

    • alveolus → bronchus → bronchiole → trachea

    • alveolus → bronchiole → bronchus → trachea

    Choose your answer

    Did this page help you?

    3
    Sme Calculator    1 mark

    What is the approximate percentage of carbon dioxide in expired air?

    • 16 %

    • 0.04 %

    • 4 %

    • 21 %

    Choose your answer

    Did this page help you?

    1
    Sme Calculator    1 mark

    Extended Tier Only

    The diagram below shows a cross-section through an alveolus and a capillary.

    11--image-6-alveolus-and-capillary

    Why does oxygen move from P to Q?

    • The concentration of carbon dioxide is lower in the alveolus than in the blood.

    • The concentration of oxygen in the blood is lower than in the air in the capillary.

    • Oxygen must replace carbon dioxide.

    • The concentration of oxygen in the blood is lower than the air in the alveolus.

    Choose your answer

    Did this page help you?

    2
    Sme Calculator    1 mark

    Extended Tier Only

    Some amphibians, such as frogs, can use their skin as a gas exchange surface.

    What are the most likely characteristics of the surface of the skin in these amphibians?

     

    surface area

    type of skin
    A

    small

    thick
    B

    large

    thick
    C

    small

    thin
    D

    large

    thin

      Choose your answer

      Did this page help you?

      3
      Sme Calculator      1 mark

      Compared to the composition of atmospheric air, the air exhaled by a man contains:

      • more water vapour, more carbon dioxide.

      • more water vapour, less carbon dioxide.

      • less water vapour, more carbon dioxide.

      • less water vapour, less carbon dioxide.

      Choose your answer

      Did this page help you?

      4
      Sme Calculator      1 mark

      The diagram shows the composition of four samples of air (O2 = oxygen, CO2 = carbon dioxide, N2 = nitrogen).

      11--image-2-composition-of-air

      Which sample is inspired air and which sample is expired air?

       

      inspired air

      expired air

      A

      R

      S

      B

      P

      R

      C

      Q

      P

      D

      S

      R

        Choose your answer

        Did this page help you?

        1
        Sme Calculator        1 mark

        The diagram shows part of the structure of a human lung.

        Where would the concentration of carbon dioxide be highest?

        11--image-3-alveolus11--image-3-alveolus

          Choose your answer

          Did this page help you?

          2
          Sme Calculator          1 mark

          A person exhales, and the air from their lungs is collected and placed in a gas jar. A second gas jar contains normal atmospheric air. A candle is set alight and is placed inside each gas jar as shown. The time taken for each flame to go out is measured with a stopwatch.

          -11--image-7-gas-jars

          The table shows the results of this experiment.

          gas jar

          time for candle flame to go out /s

          1

          7

          2

          12

          Which of the following is a correct explanation for the difference between the results in jars 1 and 2?

          • Jar 1 contains atmospheric air which has less oxygen than exhaled air.

          • Jar 1 contains exhaled air which has less oxygen compared to atmospheric air.

          • Jar 2 contains atmospheric air which has more carbon dioxide than exhaled air.

          • Jar 2 contains exhaled air which has more carbon dioxide than oxygen in it.

          Choose your answer

          Did this page help you?

          3
          Sme Calculator          1 mark

          Extended Tier Only

          Which of the following helps carbon dioxide to be excreted rapidly into the alveoli from the blood in the lungs?

          1. Inhaled air has a lower concentration of carbon dioxide than the blood constantly pumping through the lungs.
          2. Alveoli have thick walls and a large surface area.
          3. Alveoli have thin walls and a large surface area.
          4. The concentration of carbon dioxide in the blood is lower than in the alveoli.

          • 1, 2 & 4 only

          • 3 only

          • 1 & 3 only

          • 3 & 4 only

          Choose your answer

          Did this page help you?