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3 marksRespiration

CSEC Biology · January 2013 · Paper 2 · Question 4(b)(ii)b)

Gaseous exchange occurs in plants as well as in animals.

Explain why in plants there is a difference in the percentage of the respiratory gases exchanged during the day compared with the percentage exchanged during the night.

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Other parts of this question

  1. 4(a)(i)Name the structures responsible for gaseous exchange in humans and in fish.[2 marks]
  2. 4(a)(ii)Identify THREE features that the structures named in (i) above have in common.[3 marks]
  3. 4(b)(i)Draw and annotate a diagram to show how oxygen and carbon dioxide are exchanged across the respiratory surface of a human.[3 marks]
  4. 4(b)(ii)a)Name the process by which gases are exchanged in plants.[1 mark]
  5. 4(c)Explain the effect of cutting and burning forests on the operation of the carbon cycle, and on the environment.[3 marks]

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