Q.1
Which of these molecules only moves by simple diffusion?
  • Water
  • Glucose
  • Cholesterol
  • Carbon dioxide
Q.2
Diffusion is...
  • active
  • inactive
  • passive
  • impassive
Q.3
The rate of diffusion is increased in which of the following situations?
  • If there are fewer molecules
  • If the surface area is increased
  • If the temperature is decreased
  • If the diffusion distance is greater
Q.4
Active transport is where molecules use a carrier and are moved...
  • with the concentration gradient
  • along the concentration gradient
  • against the concentration gradient
  • equally to the concentration gradient
Q.5
Diffusion happens faster in which of the following situations?
  • If the difference in concentration is bigger
  • If the difference in concentration is smaller
  • If the difference in concentration is the same
  • The difference in concentration makes no difference to the rate of diffusion
Q.6
Diffusion is the movement of particles from high concentration to which of the following?
  • Higher concentration
  • Lower concentration
  • Equal concentration
  • High concentration
Q.7
Diffusion requires which of the following?
  • Energy
  • No energy
  • Glucose
  • Insulin
Q.8
Which of these molecules is too big to diffuse through a membrane, using simple diffusion?
  • Starch
  • Oxygen
  • Carbon dioxide
  • Water
Q.9
Which of these is a major site for gaseous exchange in the body?
  • Kidney tubule
  • Alveolus
  • Heart
  • Aorta
Q.10
Diffusion is fast in the lungs. Why is this?
  • Because the lungs have a huge area
  • Because the lungs have a huge surface area
  • Because the lungs have a huge volume
  • Because the lungs have a huge density
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