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Food Chains, Food Webs, and Decomposers · CSEC Biology

63 past-paper questions on Food Chains, Food Webs, and Decomposers, part of Living Organisms in the Environment, from every CSEC Biology paper on Quelpr.

Practise Food Chains, Food Webs, and Decomposers
  1. 1(a)6 marks· Biology Q1 1(a)Complete Table 1 using ONLY the organisms shown in the food webs in Figure 1.
  2. 1(a)(i)4 marks· Biology Q1 1(a)(i)Use the data in Table 1 to construct a graph showing the percentage decay of fresh green leaves at the temperatures investigated.
  3. 1(a)(ii)2 marks· Biology Q1 1(a)(ii)Identify TWO precautions each group should take in setting up their investigations.
  4. 1(a)(iv)2 marks· Biology Q1 1(a)(iv)Identify TWO carnivores from the data contained in Table 1 and the pie chart.
  5. 1(b)2 marks· Biology Q1 1(b)Identify TWO similarities between the aquatic and terrestrial food webs.
  6. 1(b)(i)2 marks· Biology Q1 1(b)(i)Suggest ONE conclusion that may be drawn from the information presented in Table 1 and your graph.
  7. 1(b)(i)2 marks· Biology Q1 1(b)(i)Identify TWO producers in the food web in Figure 3.
  8. 1(b)(i)2 marks· Biology Q1 1(b)(i)From the organisms the students find in the habitat, identify a food chain with at least FOUR organisms.
  9. 1(b)(ii)2 marks· Biology Q1 1(b)(ii)Give ONE explanation for the conclusion arrived at in (b)(i) above.
  10. 1(b)(iii)2 marks· Biology Q1 1(b)(iii)One club member suggested that at a temperature of 80°C no decay would have occurred. Do you support this view? Explain your answer.
  11. 1(c)4 marks· Biology Q1 1(c)One of the goals of Green Minds is to promote the use of natural fertilizers by gardeners in the school's neighbourhood. Identify FOUR points about fertilisers that club members should provide to the neighbourhood…
  12. 1(c)(i)3 marks· Biology Q1 1(c)(i)Using the information in Table 2 construct a food web with TEN organisms.
  13. 1(c)(ii)2 marks· Biology Q1 1(c)(ii)Explain why there are usually no more than four trophic levels in a food web.
  14. 1(c)(ii)1 mark· Biology Q1 1(c)(ii)Name ONE group of soil organisms that is important in the recycling of soil nutrients.
  15. 1(c)(v)a)3 marks· Biology Q1 1(c)(v)a)Define the term 'carnivore'.
  16. 1(f)(i)2 marks· Biology Q1 1(f)(i)Name TWO important groups of microorganisms whose activities are influenced by environmental conditions.
  17. 1(f)(ii)1 mark· Biology Q1 1(f)(ii)Identify ONE cycle which depends on the activities of microorganisms.
  18. 1(f)(iii)2 marks· Biology Q1 1(f)(iii)Explain the importance of the microorganisms named in (f)(i) in natural cycles.
  19. 1(g)(i)2 marks· Biology Q1 1(g)(i)Name TWO types of decomposers that are usually found in food webs.
  20. 1(g)(ii)3 marks· Biology Q1 1(g)(ii)Describe the role decomposers play in the recycling process.
  21. 2(a)4 marks· Biology Q2 2(a)State the name of the processes numbered I to IV.
  22. 2(a)3 marks· Biology Q2 2(a)Complete the diagram by writing the appropriate term in EACH of the boxes labelled A, B and C.
  23. 2(a)(i)3 marks· Biology Q2 2(a)(i)In the box provided below, draw a food web consisting of the following organisms: Algae, Small fish, Tadpole, Water snake, Egret, Eagle.
  24. 2(a)(ii)1 mark· Biology Q2 2(a)(ii)What is the role of the organism at the start of the food web?
  25. 2(a)(iii)a)1 mark· Biology Q2 2(a)(iii)a)Name the organism which performs EACH of the following functions in the food web drawn in (a) (i) on page 10: Both as a prey and a predator.
  26. 2(a)(iii)b)1 mark· Biology Q2 2(a)(iii)b)Name the organism which performs EACH of the following functions in the food web drawn in (a) (i) on page 10: Primary consumer.
  27. 2(a)(iii)c)1 mark· Biology Q2 2(a)(iii)c)Name the organism which performs EACH of the following functions in the food web drawn in (a) (i) on page 10: Secondary consumer.
  28. 2(a)(iii)d)1 mark· Biology Q2 2(a)(iii)d)Name the organism which performs EACH of the following functions in the food web drawn in (a) (i) on page 10: Tertiary consumer (top carnivore).
  29. 2(a)(iv)1 mark· Biology Q2 2(a)(iv)From your food web in (a) (i), draw a food chain consisting of THREE organisms.
  30. 2(a)(v)1 mark· Biology Q2 2(a)(v)What is the role of the organism to which the arrow points in a food chain?
  31. 2(a)(vi)2 marks· Biology Q2 2(a)(vi)Explain why energy flows in one direction in the food chain.
  32. 2(b)(i)1 mark· Biology Q2 2(b)(i)Name ONE type of organism responsible for decomposing organic waste.
  33. 2(b)(i)2 marks· Biology Q2 2(b)(i)Briefly describe ONE route by which the nitrogen excreted from animals (in the form of urea) is made available to plants.
  34. 2(b)(iii)2 marks· Biology Q2 2(b)(iii)State TWO reasons why the type of organism named in (b)(i) is important in an ecosystem.
  35. 3(a)5 marks· Biology Q3 3(a)From Table 3, identify organisms at EACH trophic level shown in Table 4. Write your answer in the spaces provided in Table 4.
  36. 3(a)5 marks· Biology Q3 3(a)Identify, from the food web shown in Figure 4, a food chain with FOUR trophic levels. Draw the food chain in the space provided below.
  37. 3(a)1 mark· Biology Q3 3(a)Explain the unique role of producers in the ecosystem.
  38. 3(b)(i)2 marks· Biology Q3 3(b)(i)Identify A and B.
  39. 3(b)(i)2 marks· Biology Q3 3(b)(i)Give TWO examples of decomposers.
  40. 3(b)(ii)2 marks· Biology Q3 3(b)(ii)Using a named example, explain the role of B in the ecosystem.
  41. 3(b)(ii)3 marks· Biology Q3 3(b)(ii)Why are decomposers important to organisms in a food web?
  42. 3(c)(iii)3 marks· Biology Q3 3(c)(iii)Give ONE example of a decomposer and explain how a decomposer releases carbon dioxide to the atmosphere.
  43. 3(c)(iv)2 marks· Biology Q3 3(c)(iv)Suggest why energy from the sun flows in one direction while materials are cycled within the ecosystem.
  44. 3(d)4 marks· Biology Q3 3(d)In addition to energy, materials are also cycled through various trophic levels and the abiotic environment. Using a diagram of the nitrogen cycle, show FOUR named processes which assist in recycling nitrogen in the…
  45. 3(e)1 mark· Biology Q3 3(e)State the name of the organism responsible for ONE of the processes named in (c) above.
  46. 4(a)6 marks· Biology Q4 4(a)With the aid of a diagram, outline THREE processes which return carbon to the atmosphere and ONE which removes it. (Include the form in which the carbon is found in the atmosphere.)
  47. 4(a)4 marks· Biology Q4 4(a)Name the processes labelled A, B, C and D.
  48. 4(a)(i)8 marks· Biology Q4 4(a)(i)Explain why food chains usually begin with a plant species.
  49. 4(a)(ii)8 marks· Biology Q4 4(a)(ii)Using an appropriate diagram, show how a plant or animal may belong to more than one food chain.
  50. 4(a)(iii)8 marks· Biology Q4 4(a)(iii)Explain why the number of organisms decreases at the successive trophic levels.
  51. 4(c)(i)3 marks· Biology Q4 4(c)(i)When leaves fall from plants, microorganisms feed on them. What is the name given to these microorganisms?
  52. 5(a)6 marks· Biology Q5 5(a)Using a diagram, illustrate how any THREE named processes are involved in the recycling of carbon in nature.
  53. 5(a)(i)4 marks· Biology Q5 5(a)(i)Draw a simplified labelled diagram of the nitrogen cycle to show THREE processes that involve bacteria and ONE process that does not involve bacteria.
  54. 5(a)(i)4 marks· Biology Q5 5(a)(i)Name the process carried out by bacteria at EACH of the stages indicated by P, Q, R and S.
  55. 5(b)4 marks· Biology Q5 5(b)Outline how decomposers assist in the cycling of carbon dioxide to make it available to green plants.
  56. 6(b)(ii)9 marks· Biology Q6 6(b)(ii)Construct a food web which describes the trophic relationship among four organisms in a community.
  57. 6(b)(iii)9 marks· Biology Q6 6(b)(iii)State which organism(s) in your web would have the least amount of energy available.
  58. 3(a)(i)1 mark· CSEC Biology · May/June 2021 · Paper 2Identify a producer from the food web.
  59. 3(a)(iii)1 mark· CSEC Biology · May/June 2021 · Paper 2Identify a primary consumer from the food web.
  60. 3(b)2 marks· CSEC Biology · May/June 2021 · Paper 2State two roles of the producer in the food web.
  61. 3(d)(i)2 marks· CSEC Biology · May/June 2021 · Paper 2Explain why there are fewer organisms at the top than at the bottom of the food web.
  62. 3(d)(ii)4 marks· CSEC Biology · May/June 2021 · Paper 2Discuss two possible consequences of the hawk becoming extinct in the ecosystem shown in Figure 3.
  63. 3(e)2 marks· CSEC Biology · May/June 2021 · Paper 2Suggest two reasons why decomposers are important organisms in all food webs.

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