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3 marksHomeostasis and Hormonal Action

CAPE Biology Unit 2 · 2003 · Paper 1 · Question 6(a)(i)

Figure 7 shows the analysis of carbon dioxide evolution and ethylene concentration given off by harvested green bananas over 12 days.

Comment on the volumes of gases produced, their sequence, and interrelationships.

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Other parts of this question

  1. 6(a)(ii)What is the MAIN chemical process that causes the effect at days 9 to 10?[1 mark]
  2. 6(a)(iii)State ONE other chemical process occurring in the bananas that is associated with this peak.[1 mark]
  3. 6(b)(i)Suggest how this knowledge could be used to produce a market-ready fruit.[1 mark]
  4. 6(b)(ii)State when the use of that knowledge could be applied.[1 mark]
  5. 6(c)(i)To delay fruit ripening, shippers may reduce oxygen levels to 5% and increase nitrogen levels correspondingly. What other process, which also produces CO2,…[2 marks]
  6. 6(c)(ii)Genetically altered forms of ethylene biosynthetic inhibitor enzymes have been transferred into tomato plants. Suggest ONE way in which the development of the…[1 mark]

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