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ACSEE (Form 6) Gaseous Exchange and Respiration — practice questions

Explore 5 free Gaseous Exchange and Respiration questions in ACSEE (Form 6) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Gaseous Exchange and Respiration questions and exercises with answers

Showing questions 1–5 of 5.

The pleural membrane is found in the:Read the answer and worked solution →Which feature of the alveoli most directly speeds up diffusion of gases?Read the answer and worked solution →Fix the alveoli statementRead the answer and worked solution →Spot the intruderRead the answer and worked solution →Sort the exchange surfacesRead the answer and worked solution →

Worked practice questions

The pleural membrane is found in the:

  1. lungs, lining the chest cavity
  2. ear, behind the eardrum
  3. eye, covering the retina
  4. kidney, around the nephron
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Correct answer: A. lungs, lining the chest cavity

1. The pleural membrane is a lung structure, lining the lungs and the chest cavity. 2. It secretes pleural fluid, which lubricates the surfaces so the lungs slide freely during breathing. 3. Severe damage causes pain on breathing and reduced lung inflation. 4. Mistaking it for the eye leads to answers about blurred vision, and mistaking it for the tympanic membrane leads to answers about hearing loss. 5. Both of those confusions were recorded and both are wrong. _Source: NECTA ACSEE 2023 Biology 133/1, Question 2: Gaseous Exchange and Respiration_

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Which feature of the alveoli most directly speeds up diffusion of gases?

  1. A thick muscular wall
  2. Walls one cell thick
  3. A dry inner lining
  4. A rigid cartilage ring
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Correct answer: B. Walls one cell thick

1. Rate of diffusion rises as the distance the gas must travel falls. 2. Alveolar walls are one cell thick, and the capillary wall beside them is also one cell thick. 3. That gives a diffusion path of about two cells between air and blood. 4. A thick or rigid wall would lengthen that path and slow exchange. 5. The lining is moist, not dry, because gases must dissolve before they diffuse. _Source: NECTA ACSEE 2023 Biology 133/1, Question 2: Gaseous Exchange and Respiration_

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Fix the alveoli statement

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Questions
  1. Statement parts
    1. Alveoli
    2. give
    3. a
    4. large
    5. volume
    6. to
    7. surface
    8. area
    9. ratio
    Correction
    surface area — the ratio runs surface area to volume, not the reverse
    Incorrect part
    volume
  2. Statement parts
    1. Alveolar
    2. walls
    3. are
    4. ten
    5. cells
    6. thick
    Correction
    one — a single cell thickness keeps the diffusion path short
    Incorrect part
    ten
  3. Statement parts
    1. The
    2. alveolar
    3. lining
    4. must
    5. stay
    6. dry
    Correction
    moist — gases must dissolve before they can diffuse
    Incorrect part
    dry
Instructions
One token in each line is wrong. Tap it, then read the correction.

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