21.2. Biotechnology
A subsection of Biology, 0610, through 21. Biotechnology and genetic modification
Listing 10 of 143 questions
Yeast can respire aerobically and anaerobically. State the balanced chemical equation for aerobic respiration by yeast. When yeast respires anaerobically, ethanol is released. Ethanol is a type of sustainable resource that can be produced from a wide range of crops. It can be used as a biofuel. Table 5.1 summarises some information about crops that are used to make biofuel. Table 5.1 crop biofuel produced energy yield / GJ per ha optimum growth temperature / °C optimum annual rainfall range / mm wheat ethanol 53–84 800–1200 corn ethanol 63–76 360–1000 sugar beet ethanol 110–122 360–1000 sugar cane ethanol 110–140 800–1200 oil palm oil 150–166 1100–2500 Uruguay has an average temperature range of 12 °C to 24 °C and an average annual rainfall of 1000 mm. Suggest and explain which crop would be the most suitable crop to grow for producing biofuel in Uruguay. Use the information in Table 5.1 to justify your choice. Sugar cane requires soil with high concentrations of nitrogen and potassium. Describe how the lack of nitrate ions would affect the production of sugar cane. Researchers in Brazil are considering using microscopic algae that live in water to produce biofuels. They have found that algae can produce a maximum amount of energy of 200 GJ per m2. 1 m2 = 0.0001 ha Convert the production of biofuel from algae into GJ per ha. Space for working. GJ per ha Suggest why people who are concerned about the environment want countries to produce more biofuel from algae rather than the crops listed in Table 5.1. Define the term sustainable development.
0610_w17_qp_41
THEORY
2017
Paper 4, Variant 1
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Questions Discovered
143