Revision NotesExam QuestionsFlashcardsPast Papers
IBBiologyDPHLExam QuestionsForm & FunctionGas Exchange

Gas Exchange (DP IB Biology: HL)

Exam Questions

3 hours35 questions

Select a question set to download for
Gas Exchange

Select an answer set to view for
Gas Exchange

Easy
Medium
Hard
1
Sme Calculator1 mark

Which row of the table describes the best overall conditions for gas exchange in the lungs?

 

Surface Area

Diffusion Pathway

Concentration Gradient

A

Large

Long

Steep

B

Large

Short

Steep

C

Large

Short

Shallow

D

Small

Short

Shallow

    Choose your answer

    Did this page help you?

    2
    Sme Calculator    1 mark

    Which row of the table shows the events of inspiration in the correct sequence?

     

    1

    2

    3

    4

    A

    Diaphragm and external intercostal muscles contract

    Volume of thorax increases

    Thorax pressure drops

    Air is drawn into the lungs down its pressure gradient

    B

    Thorax expands

    Thorax pressure drops

    Diaphragm and external intercostal muscles contract

    Volume of thorax increases

    C

    Air is drawn into the lungs down its pressure gradient

    Diaphragm and external intercostal muscles contract

    Thorax pressure drops

    Volume of thorax increases

    D

    Thorax pressure drops

    Volume of thorax increases

    Thorax expands

    Air is drawn into the lungs down its pressure gradient

      Choose your answer

      Did this page help you?

      3
      Sme Calculator      1 mark

      Which of the following is a feature of forced expiration?

      • The diaphragm contracts.

      • The thorax undergoes a drop in pressure. 

      • The internal intercostal muscles contract. 

      • The external intercostal muscles contract.

      Choose your answer

      Did this page help you?

      4
      Sme Calculator      1 mark

      Which aspects of ventilation are assisted by the solution secreted by type II pneumocytes?

      1. Dissolving of oxygen gas.

      2. Recoil of alveolar walls during expiration.

      3. Preventing alveoli from collapsing.

      4. Diffusion of carbon dioxide gas into the alveoli.

      • I, II, and IV only.

      • I and IV only.

      • I, III, and IV only.

      • I and III only.

      Choose your answer

      Did this page help you?

      5
      Sme Calculator      1 mark

       How can the tidal volume of the lungs be measured?

      • Spirometer

      • Inhaler

      • Data logger

      • Oxygen meter

      Choose your answer

      Did this page help you?

      1
      Sme Calculator      1 mark

      An alveolus has several features to allow efficient gas exchange.

      7xBrVPfx_1

       

      Which row of the table below matches each feature of gas exchange to the correct label on the alveolus?

       

      I

      II

      III

      A

      High concentration of oxygen to maintain a steep concentration gradient

      One cell thick for short diffusion distance

      Allows gases to dissolve to aid diffusion

      B

      High concentration of carbon dioxide to maintain steep concentration gradient

      Allows gases to dissolve to aid diffusion

      One cell thick for short diffusion distance

      C

      One cell thick for short diffusion distance

      High concentration of oxygen to reduce the concentration gradient

      Allows gases to dissolve to aid diffusion

      D

      Allows gases to dissolve to aid diffusion

      Allows gases to dissolve to aid diffusion

      High concentration of oxygen to maintain a steep concentration gradient

        Choose your answer

        Did this page help you?

        2
        Sme Calculator        1 mark

        What is the function of pulmonary surfactant?

        • To increase surface tension on the alveolar walli.

        • To reduce the diffusion distance across the alveolar wall.

        • To stop the alveoli sacs from sticking together.

        • To trap microorganisms and prevent infection.

        Choose your answer

        Did this page help you?

        3
        Sme Calculator        1 mark

        A scientist examines a cross section of the wall of a bronchus under an electron microscope. Which of the following would be observed?

        1. Smooth muscle.

        2. Cartilage cells.

        3. Ciliated cells.

        • I and II.

        • I and III.

        • II and III.

        • I, II and III.

        Choose your answer

        Did this page help you?

        4
        Sme Calculator        1 mark

        Which set of conditions is required to allow the intake of air into the lungs during ventilation?

        • Contracted diaphragm, increased volume and increased pressure inside the thorax.

        • Relaxed diaphragm, increased volume and decreased pressure inside the thorax.

        • Relaxed diaphragm, decreased volume and increased pressure inside the thorax.

        • Contracted diaphragm, increased volume and decreased pressure inside the thorax.

        Choose your answer

        Did this page help you?

        5
        Sme Calculator        1 mark

        What is an example of a pair of antagonistic muscles?

        • Internal intercostal muscles and diaphragm.

        • Diaphragm and abdominal muscles.

        • Abdominal and internal intercostal muscles.

        • Diaphragm and external intercostal muscles.

        Choose your answer

        Did this page help you?

        6
        Sme Calculator        1 mark

        The diagram shows a trace recorded from a spirometer.

        5ktomJeq_4

        Which label represents the tidal volume?

         

          Choose your answer

          Did this page help you?

          7
          Sme Calculator          1 mark

          Identify the set of conditions under which transpiration would occur at the slowest rate.

           

          Humidity

          Temperature

          Air movement

          Light intensity

          A

          Low

          Low

          High

          High

          B

          High

          Low

          Low

          Low

          C

          Low

          High

          Low

          Low

          D

          High

          Low

          High

          High

            Choose your answer

            Did this page help you?

            8
            Sme Calculator            1 mark

            What does a potometer measure?

            • The rate of photosynthesis of a plant

            • The rate of water uptake of a plant

            • The rate of respiration of a plant

            • The rate of transpiration of a plant

            Choose your answer

            Did this page help you?

            9
            Sme Calculator            1 mark

            Certain environmental factors can affect the rate of transpiration in plants. The effect of one environmental factor on transpiration rate is shown in the graph below.

            q9_9-1_transport_in_the_xylem_of_plants_ib_biology_hl_mcq

            Identify the environmental factor that is having this effect on transpiration rate.

            • Temperature

            • Humidity

            • Air movement

            • Light intensity

            Choose your answer

            Did this page help you?

            1
            Sme Calculator            1 mark

            During a gas exchange investigation, measurements were recorded from four animals that were observed as they breathed normally over a period of 5 minutes. Note that the efficiency of gas exchange was the same in all four animals and that tidal volume refers to the volume of air that moves into the lungs with each normal breath.

            Which animal had the highest oxygen intake during five minutes of normal breathing?

            Animal

            Tidal volume / dm3

            Breathing rate / breaths per minute

            A

            0.2

            10

            B

            0.6

            20

            C

            0.5

            18

            D

            0.33

            24

              Choose your answer

              Did this page help you?

              2
              Sme Calculator              1 mark

              Which row of the table contains five correct statements about forced expiration?

               

              Ribs

              Diaphragm

              Pressure in thorax

              External intercostal muscles

              Internal intercostal muscles

              A

              Move down and inwards

              Contracts

              Increases

              Relax

              Relax

              B

              Move down and inwards

              Relaxes

              Increases

              Relax

              Contract

              C

              Move down and inwards

              Relaxes

              Decreases

              Recoil

              Contract

              D

              Move up and outwards

              Contracts

              Decreases

              Contract

              Contract 

                Choose your answer

                Did this page help you?

                3
                Sme Calculator                1 mark

                The diagram shows a potometer set up to measure the rate of transpiration in a piece of cut plant. 

                potometer

                For a potometer with a cylindrical capillary of the internal diameter of d mm, the bubble was measured to travel h mm in an experimental time of s seconds. 

                Which is the correct formula to calculate the rate of transpiration (as a volume of water uptake per unit time) in this experiment?

                • fraction numerator pi italic space d to the power of italic 2 h over denominator s end fraction

                • pi italic space d to the power of italic 2 h space s

                Choose your answer

                Did this page help you?