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CSEC Biology · May/June 2011 · Paper 2 · Question 2(a)(i)

Humans cannot survive long in a room with limited oxygen.

Suggest ONE reason why humans need oxygen to stay alive.

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Other parts of this question

  1. 2(a)(ii)Write a chemical equation which summarizes the process for which oxygen is required in living cells.[2 marks]
  2. 2(a)(iii)Name the process at (a) (ii) above.[1 mark]
  3. 2(a)(iv)In which cell organelle does the process at (a) (iii) take place?[1 mark]
  4. 2(b)(i)During his spectacular sprint, Usain Bolt's muscle cells became starved of oxygen. Explain why this happens in exercising muscles.[3 marks]
  5. 2(b)(ii)What substance is produced in Bolt's muscles which were starved of oxygen?[1 mark]
  6. 2(b)(iii)Explain how the substance in (b) (ii) above could affect Bolt's performance if he continued running for another 10 minutes.[2 marks]
  7. 2(c)(i)Some plant species are able to survive in conditions where oxygen is lacking. Name the process by which these plants get their energy.[1 mark]
  8. 2(c)(ii)Describe the process named in (c) (i) above and state TWO substances produced by this process.[3 marks]

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