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Chapter 6 Practice Paper: Respiration in Humans — question paper

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QQ/S3BI/CH6

Secondary 3 · Biology (G2 / G3)

Chapter 6 Practice Paper

Respiration in Humans

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Biology syllabus. It is not an official MOE or school examination paper. Air passages and cilia; breathing mechanics (diaphragm, ribs, intercostal muscles); alveolar adaptations for gas exchange; tobacco smoke components and health effects; aerobic and anaerobic respiration; oxygen debt.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which sequence shows the path of air from the trachea to the site of gas exchange?

    1. Abronchi → trachea → bronchioles → alveoli
    2. Btrachea → bronchi → bronchioles → alveoli
    3. Cbronchioles → alveoli → bronchi → trachea
    4. Dtrachea → bronchioles → bronchi → alveoli
    ( )
  2. 2

    A student at rest has a tidal volume of 450 cm³ and breathes 16 times per minute. Her ventilation rate is

    1. A0.72 dm³/min
    2. B3.6 dm³/min
    3. C72 dm³/min
    4. D7.2 dm³/min
    ( )
  3. 3

    When a person breathes in, the diaphragm

    1. Acontracts and flattens
    2. Brelaxes and domes upward
    3. Cstays rigid and still
    4. Dpushes the ribs upward
    ( )
  4. 4

    Carbon monoxide in tobacco smoke endangers health mainly because it

    1. Aparalyses the cilia lining the airways
    2. Bdirectly causes lung cancer
    3. Cbinds haemoglobin, reducing oxygen transport
    4. Dnarrows the bronchioles permanently
    ( )
  5. 5

    Which word equation describes anaerobic respiration in human muscle?

    1. Aglucose → carbon dioxide + ethanol + little energy
    2. Bglucose → lactic acid + little energy
    3. Cglucose + oxygen → carbon dioxide + water + much energy
    4. Dglucose + lactic acid → oxygen + much energy
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    The diagram described here shows the human breathing apparatus in section: a cartoon of the chest with the trachea branching into two bronchi, the dome-shaped diaphragm below the lungs, and ribs with intercostal muscles between them.

    1. (a)

      Name the two sets of muscles that act during breathing and state what each does during inspiration.

      [2]
    2. (b)

      Explain what happens to the pressure inside the lungs during inspiration.

      [2]
    3. (c)

      State the function of the cartilage rings around the trachea.

      [2]
  2. 2

    Alveoli are the site of gaseous exchange in the lungs.

    1. (a)

      State two structural features of the alveoli that adapt them for efficient gas exchange.

      [2]
    2. (b)

      For one feature named in (a), explain how it speeds up gas exchange.

      [2]
    3. (c)

      Describe the journey of an oxygen molecule from the air inside an alveolus to being carried away in the blood.

      [3]
  3. 3

    A runner was monitored before and during a race. At rest she took 12 breaths per minute with a tidal volume of 500 cm³. During the race she took 30 breaths per minute with a tidal volume of 1000 cm³. After the race her breathing remained deep and fast for several minutes.

    1. (a)

      Calculate her ventilation rate at rest, in cm³ per minute.

      ventilation rate =cm³/min[2]
    2. (b)

      Calculate her ventilation rate during the race and state how many times greater it is than at rest.

      [2]
    3. (c)

      Explain why her breathing remained deep and fast for several minutes after the race finished.

      [3]

— End of paper —