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Ecosystem Dynamics and Community Stability · CAPE Environmental Science Unit 1

89 past-paper questions on Ecosystem Dynamics and Community Stability, part of Fundamental Ecological Principles, from every CAPE Environmental Science Unit 1 paper on Quelpr.

Practise Ecosystem Dynamics and Community Stability
  1. 4(a)(i)1 mark· CAPE Environmental Science Unit 1 · 2004 · Paper 1Explain what is meant by the term 'species diversity'.
  2. 4(a)(ii)1 mark· CAPE Environmental Science Unit 1 · 2004 · Paper 1Rank the fields in terms of ecosystem stability, starting with the most stable.
  3. 4(a)(iii)2 marks· CAPE Environmental Science Unit 1 · 2004 · Paper 1State two reasons to support your ranking of ecosystem stability.
  4. 1(b)4 marks· CAPE Environmental Science Unit 1 · 2004 · Paper 2With reference to Figure 1, state four observations regarding the change in population density of both species over time.
  5. 2(a)8 marks· CAPE Environmental Science Unit 1 · 2004 · Paper 2Outline four differences between primary and secondary ecological succession.
  6. 2(b)6 marks· CAPE Environmental Science Unit 1 · 2004 · Paper 2Discuss the relationship between ecological succession and climax communities in the stability of ecosystems.
  7. 3(a)1 mark· CAPE Environmental Science Unit 1 · 2005 · Paper 1State the type of ecological succession that is represented in Figure 1.
  8. 3(b)(i)1 mark· CAPE Environmental Science Unit 1 · 2005 · Paper 1From Figure 1, identify the pioneer community.
  9. 3(b)(ii)1 mark· CAPE Environmental Science Unit 1 · 2005 · Paper 1From Figure 1, identify the climax community.
  10. 3(c)4 marks· CAPE Environmental Science Unit 1 · 2005 · Paper 1Describe the role of the pioneer community in ecological succession.
  11. 4(a)2 marks· CAPE Environmental Science Unit 1 · 2005 · Paper 1State the meaning of the term 'environmental resistance'.
  12. 4(b)(i)2 marks· CAPE Environmental Science Unit 1 · 2005 · Paper 1State two environmental resistance factors.
  13. 4(b)(ii)5 marks· CAPE Environmental Science Unit 1 · 2005 · Paper 1Outline how environmental resistance may result in a decrease in the rate of growth of a population.
  14. 2(a)(i)2 marks· CAPE Environmental Science Unit 1 · 2006 · Paper 1Define the term 'biotic potential'.
  15. 2(a)(ii)2 marks· CAPE Environmental Science Unit 1 · 2006 · Paper 1Define the term 'environmental resistance'.
  16. 2(b)3 marks· CAPE Environmental Science Unit 1 · 2006 · Paper 1Outline, citing one example, how biotic potential and environmental resistance interact to maintain populations within the carrying capacity of an ecosystem.
  17. 2(a)(i)2 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2What is meant by ecological succession?
  18. 2(a)(ii)2 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2What is meant by a climax community?
  19. 2(b)6 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Outline THREE differences between 'primary ecological succession' and 'secondary ecological succession'.
  20. 2(c)(i)4 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Calculate the species diversity for Stream A using the formula D = N(N - 1) / Σ n(n - 1).
  21. 2(c)(ii)2 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Rank the THREE streams in decreasing order of species diversity.
  22. 2(c)(iii)1 mark· CAPE Environmental Science Unit 1 · 2007 · Paper 2Which of the three streams, A, B or C, is the most stable?
  23. 2(c)(iv)3 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Justify your answer to 2(c)(iii).
  24. 3(a)1 mark· CAPE Environmental Science Unit 1 · 2007 · Paper 2State the name of ANY ONE of the growth stages, AB, BC or CD, shown in Figure 2.
  25. 3(b)9 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Outline the features of EACH growth stage, AB, BC and CD, shown in Figure 2.
  26. 3(c)6 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Explain how environmental resistance influences the shape of the curve from A to D in Figure 2.
  27. 3(d)(i)2 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Suggest ONE environmental condition in the ecosystem that would cause growth along interval DE.
  28. 3(d)(ii)2 marks· CAPE Environmental Science Unit 1 · 2007 · Paper 2Suggest ONE environmental condition in the ecosystem that would cause growth along interval DF.
  29. 2(a)(ii)3 marks· CAPE Environmental Science Unit 1 · 2008 · Paper 2Define ecosystem stability.
  30. 2(a)(iii)3 marks· CAPE Environmental Science Unit 1 · 2008 · Paper 2Define species diversity.
  31. 2(b)(i)1 mark· CAPE Environmental Science Unit 1 · 2008 · Paper 2State which ecosystem in Table 1 has the GREATEST species diversity.
  32. 2(b)(ii)2 marks· CAPE Environmental Science Unit 1 · 2008 · Paper 2Give ONE reason to support your answer to (b)(i).
  33. 2(c)8 marks· CAPE Environmental Science Unit 1 · 2008 · Paper 2Explain how species diversity can influence ecosystem stability, including TWO ways in your response.
  34. 1(b)4 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2With reference to Figure 1, describe how the population size of the algal species changes with the variation in nutrient concentration.
  35. 1(c)(i)8 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2For the relationship between population size of algae and nutrient concentration in Figure 1, explain using EIGHT points how nutrient variation impacts the algae population.
  36. 2(a)3 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2Distinguish between 'primary ecological succession' and 'secondary ecological succession'.
  37. 2(b)(ii)a)2 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2Using Table 1, identify the country where secondary ecological succession is: - MOST likely to occur - LEAST likely to occur.
  38. 2(b)(ii)b)10 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2Provide FIVE reasons to support your answer in EACH case in (ii) a) above.
  39. 3(a)4 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2With reference to Figure 2, describe the variation in the population size of BOTH organisms over the eight-month period.
  40. 3(c)4 marks· CAPE Environmental Science Unit 1 · 2009 · Paper 2Explain how ONE density independent factor may impact the size of the snail population.
  41. 1(a)3 marks· CAPE Environmental Science Unit 1 · 2010 · Paper 2Distinguish between 'primary ecological succession' and 'secondary ecological succession'.
  42. 1(b)(i)3 marks· CAPE Environmental Science Unit 1 · 2010 · Paper 2Describe the trend in variation of the alligator population shown in Figure 1. Use specific values in your answer.
  43. 1(b)(ii)1 mark· CAPE Environmental Science Unit 1 · 2010 · Paper 2Using the information presented in Figure 1, determine the carrying capacity of the Black River.
  44. 1(b)(iii)1 mark· CAPE Environmental Science Unit 1 · 2010 · Paper 2In which year was the carrying capacity of the Black River MOST likely achieved?
  45. 2(a)(i)5 marks· CAPE Environmental Science Unit 1 · 2010 · Paper 2Calculate the species diversity for Ecosystem B using the equation D = N(N - 1) / Σ n(n - 1).
  46. 2(a)(ii)1 mark· CAPE Environmental Science Unit 1 · 2010 · Paper 2Rank the three ecosystems in DECREASING order of species diversity.
  47. 2(a)(iii)1 mark· CAPE Environmental Science Unit 1 · 2010 · Paper 2Which of three ecosystems is the MOST stable?
  48. 2(a)(iv)4 marks· CAPE Environmental Science Unit 1 · 2010 · Paper 2Suggest FOUR reasons to support your answer to (iii) above.
  49. 2(a)5 marks· CAPE Environmental Science Unit 1 · 2011 · Paper 2Name and describe the method you would employ to collect sampling data to determine the species diversity of non-mobile organisms on a Caribbean coral reef.
  50. 2(b)(i)4 marks· CAPE Environmental Science Unit 1 · 2011 · Paper 2Using Figure 3, determine the number of individuals of each of the four species.
  51. 2(b)(ii)1 mark· CAPE Environmental Science Unit 1 · 2011 · Paper 2Calculate the percentage of the total individuals represented by Haliclona lehnerti.
  52. 2(b)(iii)4 marks· CAPE Environmental Science Unit 1 · 2011 · Paper 2Calculate the species diversity for the coral reef.
  53. 2(c)(i)2 marks· CAPE Environmental Science Unit 1 · 2011 · Paper 2Define what is meant by ecosystem stability.
  54. 2(c)(ii)4 marks· CAPE Environmental Science Unit 1 · 2011 · Paper 2Explain why an ecosystem with low species diversity may exhibit poor stability.
  55. 1(b)4 marks· CAPE Environmental Science Unit 1 · 2012 · Paper 2Using the information provided in Figure 1, describe the trend in population size of the duckweed.
  56. 2(c)(iii)1 mark· CAPE Environmental Science Unit 1 · 2012 · Paper 2Identify the country where secondary ecological succession is LEAST likely to occur.
  57. 2(c)(iv)5 marks· CAPE Environmental Science Unit 1 · 2012 · Paper 2Justify your response in (c)(iii).
  58. 1(b)(i)3 marks· CAPE Environmental Science Unit 1 · 2013 · Paper 2Calculate the species diversity for Ecosystem C using the provided formula: \[ D = \frac{N(N-1)}{\sum n(n-1)} \]
  59. 1(b)(ii)3 marks· CAPE Environmental Science Unit 1 · 2013 · Paper 2Identify which of the three ecosystems is likely to better withstand an ecological disturbance, giving ONE reason for your answer.
  60. 1(b)(i)2 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2Define 'carrying capacity'.
  61. 1(b)(ii)4 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2Explain the importance of carrying capacity in sustaining ecological balance.
  62. 1(d)(i)4 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2Using the data in Table 1 and an appropriate formula, calculate the estimated population size of deer in Royal Park.
  63. 1(d)(ii)2 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2State TWO assumptions underlying the capture-mark-recapture technique.
  64. 2(a)(ii)3 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2Calculate the change in predator population size between Month 2 and Month 7.
  65. 2(d)(ii)4 marks· CAPE Environmental Science Unit 1 · 2014 · Paper 2Using an appropriate formula, calculate the species diversity for the school garden.
  66. 1(c)(i)1 mark· CAPE Environmental Science Unit 1 · 2015 · Paper 2What is the population of iguanas in Year 2?
  67. 1(c)(ii)3 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2Define the term 'carrying capacity' AND use Figure 2 to estimate the carrying capacity of the mangrove habitat.
  68. 1(c)(iii)6 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2Discuss TWO factors that may influence population size at the carrying capacity.
  69. 2(b)(ii)3 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2State which of the three environments is expected to have the GREATEST species diversity AND give ONE reason to support your answer.
  70. 2(b)(iii)6 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2Explain, using six points, how species diversity influences ecosystem stability.
  71. 2(c)4 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2Use the information provided in Table 2 to calculate the population size of the manatees.
  72. 4(c)(i)2 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2State the trend in the population of the native species AND the population of introduced species illustrated in Figure 4.
  73. 4(c)(iii)3 marks· CAPE Environmental Science Unit 1 · 2015 · Paper 2Calculate the average annual decrease in population of the native species for the period represented in Figure 4.
  74. 1(b)(i)3 marks· CAPE Environmental Science Unit 1 · 2016 · Paper 2State THREE deductions concerning the variation of the population of the species recorded by Student A.
  75. 1(b)(ii)3 marks· CAPE Environmental Science Unit 1 · 2016 · Paper 2Calculate the difference between the carrying capacity values obtained by Student A and Student B.
  76. 2(a)3 marks· CAPE Environmental Science Unit 1 · 2016 · Paper 2State THREE ways in which primary ecological succession differs from secondary ecological succession.
  77. 2(b)(ii)7 marks· CAPE Environmental Science Unit 1 · 2016 · Paper 2Identify which country is MOST likely to undergo ecological succession and justify your answer.
  78. 1(c)(iv)6 marks· CAPE Environmental Science Unit 1 · 2017 · Paper 2Discuss the relationship between species diversity and ecosystem stability.
  79. 2(a)(i)3 marks· CAPE Environmental Science Unit 1 · 2017 · Paper 2Explain the difference between the methods used by Group I and Group II respectively.
  80. 2(a)(ii)6 marks· CAPE Environmental Science Unit 1 · 2017 · Paper 2Using the data collected by Group II, calculate the estimated density for Species A and the percentage frequency of Species B.
  81. 1(b)(i)4 marks· CAPE Environmental Science Unit 1 · 2018 · Paper 2Distinguish between 'primary succession' and 'secondary succession'.
  82. 1(b)(ii)2 marks· CAPE Environmental Science Unit 1 · 2018 · Paper 2State TWO possible causes of secondary succession.
  83. 1(c)(i)2 marks· CAPE Environmental Science Unit 1 · 2018 · Paper 2Define the term 'biotic potential'.
  84. 1(c)(ii)4 marks· CAPE Environmental Science Unit 1 · 2018 · Paper 2Explain how environmental resistance affects population growth in natural ecosystems.
  85. 2(a)(i)2 marks· CAPE Environmental Science Unit 1 · 2019 · Paper 2Define the term 'biotic potential'.
  86. 2(a)(ii)3 marks· CAPE Environmental Science Unit 1 · 2019 · Paper 2Explain how environmental resistance regulates population growth in a natural ecosystem.
  87. 2(b)(i)2 marks· CAPE Environmental Science Unit 1 · 2019 · Paper 2Explain what is happening to the red deer population at the point X.
  88. 2(b)(ii)3 marks· CAPE Environmental Science Unit 1 · 2019 · Paper 2Explain what will happen if the population of red deer exceeds the carrying capacity.
  89. 6(b)(i)2 marks· CAPE Environmental Science Unit 1 · 2019 · Paper 2During which period was there the greatest change in the number of organisms?

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