Target: 10 questions in 10 minutes
1. Which of the following is an adaptation of mammalian lungs that facilitates efficient gas exchange?
  • A. Wall of alveolus is one cell thick
  • B. Spherical shape of an alveolus producing large surface-area to volume ratio
  • C. Extensive arteriole network
  • D. Surfactant to increase surface tension

2. What structural feature of plant leaves aids in the regulation of transpiration rates?

  • A. Dry surfaces of spongy mesophyll
  • B. Thick waxy cuticle
  • C. Density of chloroplasts
  • D. High temperature

Q3+4: The image shows a potometer used to measure rates of transpiration.

Potometer diagram

 Theresa knott on en.wikipedia (adapted)
CC-BY-SA 3.0
3. Which part of the potometer labelled A to D is used to reset the position of the air bubble?
4. Which statement correctly describes a factor that directly affects the rate of transpiration in plants?
  • A. Decreased humidity increases transpiration rates
  • B. Increased humidity increases transpiration rates.
  • C. Presence of stomatal guard cells decreases transpiration rates
  • D. Increased CO2 concentration increases transpiration rates.

5. Which option in the table below describes the processes that occur during exhalation (breathing out)?

  Diaphragm  External Intercostals  Abdominal Muscles
A Relax Contract Relax
B Contract Contract Relax
C Contract Relax Contract
D Relax Relax Contract

Q6-8. The image shows a transverse section of a leaf.

Mesophyte_leaf_Syringia cross-section

 Berkshire Community College Bioscience Image Library (Adapted)
public domain
6. Where do gases and water vapour enter and exit the leaf? Choose from labels A to D.

7. Which part labelled A to D transports water under tension using properties of cohesion and adhesion?
8. Which part labelled A to D is associated with guard cells?

Q9&10. The image shows lung volumes on a spirometry tracing.

Mesophyte_leaf_Syringia cross-section

 LungVolume.jpg: The original uploader was Vihsadas at English Wikipedia.derivative work: rscottweekly (adapted)
CC-BY-SA 3.0
9. Which volumes add together to equal vital capacity?
  • A. I and III only
  • B. II and III only
  • C. I, II and III only
  • D. I and IV only
10. Expiratory reserve volume can be calculated from the vital capacity minus which volume(s)?
  • A. I and III only
  • B. I only
  • C. II only
  • D. III only