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1 markEnergy Flow and Nutrient Cycling

CAPE Biology Unit 2 · 2006 · Paper 2 · Question 1(f)

Suggest TWO reasons why it is better to use plant or animal manure rather than chemical fertilizers alone for fertilizing crops.

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  1. 1(a)With reference to the graph in Figure 1, determine which fertilizer regimen gives the HIGHEST yield of rice.[1 mark]
  2. 1(b)Calculate the percentage increase in yield when the amount of Azolla is doubled from 7 t to 14 t as the sole fertilizer administered.[1 mark]
  3. 1(c)Determine the difference in rice production, in kg ha⁻¹, between a field treated with urea only at 87 kg ha⁻¹ and one treated with both urea at 43.5 kg ha⁻¹…[1 mark]
  4. 1(d)Name TWO factors, other than nutrient availability from fertilizer, that would affect rice yield.[1 mark]
  5. 1(e)Name ONE type of plant compound that requires the functionally useful element in urea.[1 mark]
  6. 1(g)In the box provided, draw and label the cells in region A between the parallel lines shown in Figure 2.[4 marks]

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