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Chapter 6 Practice Paper: Respiration in Humans — question paper

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QQ/S3CBI/CH6

Secondary 3 · Combined Science (Biology) (G2 / G3)

Chapter 6 Practice Paper

Respiration in Humans

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • Biological drawings are not required; describe or label structures in words where asked.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Biology) syllabus. It is not an official MOE or school examination paper. Chapter 6 (air pathway; alveolus adaptation; tobacco smoke toxins; 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 follows air inwards correctly?

    1. Atrachea → larynx → bronchi
    2. Blarynx → trachea → bronchi
    3. Cbronchi → bronchioles → trachea
    4. Dalveoli → bronchioles → bronchi
    ( )
  2. 2

    Gaseous exchange takes place in the

    1. Abronchi
    2. Blarynx
    3. Calveoli
    4. Dtrachea
    ( )
  3. 3

    Which component of tobacco smoke binds to haemoglobin?

    1. Anicotine
    2. Btar
    3. Ccarbon monoxide
    4. Dwater vapour
    ( )
  4. 4

    The word equation glucose → lactic acid + energy describes

    1. Aaerobic respiration in muscle
    2. Bphotosynthesis
    3. Ccombustion of glucose
    4. Danaerobic respiration in human muscle
    ( )
  5. 5

    After a race, rapid deep breathing continues because

    1. Athe lungs need re-inflating
    2. Bextra oxygen is needed to break down lactic acid
    3. Cthe blood contains too little carbon dioxide
    4. Dthe heart has stopped needing oxygen
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    The human breathing system is built for diffusion.

    1. (a)

      Name the site of gaseous exchange and the vessels that surround it.

      [2]
    2. (b)

      State two structural adaptations of the alveoli for exchange and explain how each helps.

      [4]
    3. (c)

      Name the gas that diffuses from the blood into the alveoli, and state the process that produces it in the cells.

      [2]
  2. 2

    Samples of inspired and expired air were tested.

    1. (a)

      A glowing splint relights in sample P but not in sample Q. Identify each sample and explain the difference.

      [3]
    2. (b)

      Limewater turns cloudy when sample Q is bubbled through, but stays clear with P. State the gas responsible.

      [1]
    3. (c)

      Name one gas present at about the same percentage in both samples and state why it is unchanged.

      [2]
  3. 3

    A cyclist pedals hard up a steep slope for two minutes, then stops and breathes deeply for several minutes.

    1. (a)

      Explain why her leg muscles used anaerobic respiration during the climb.

      [2]
    2. (b)

      State the word equation for the process in (a).

      [1]
    3. (c)

      Explain why she keeps breathing rapidly and deeply after stopping, using the term oxygen debt.

      [3]

— End of paper —