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1 markCellular Transport Mechanisms

CSEC Human and Social Biology · January 2011 · Paper 2 · Question 10(c)(ii)

Gas exchange at the respiratory surface.

Identify ONE way in which osmosis differs from simple diffusion of gases.

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Other parts of this question

  1. 10(a)List THREE structures common to plant and animal cells.[3 marks]
  2. 10(b)(i)Using ONE arrow, show on Figure 5 the direction of net movement of water molecules.[1 mark]
  3. 10(b)(ii)Which part of the container, A or B, has the greater concentration of water molecules?[1 mark]
  4. 10(b)(iii)Explain the process of osmosis, using the illustration in Figure 5.[3 marks]
  5. 10(c)(i)Name the process by which oxygen and carbon dioxide move across the alveoli.[1 mark]

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