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2 marksEcological Studies and Factors

CSEC Biology · May/June 2008 · Paper 2 · Question 1(c)(iii)

Besides the components in Figure 1, soil also contains living organisms. Figure 3 shows six soil organisms.

Organisms 1 and 3 in Figure 3 are usually found under stones or leaf litter. Suggest TWO reasons why these organisms are found in this type of habitat.

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Other parts of this question

  1. 1(a)(i)Calculate the percentage of air in Sample A. Show your working.[2 marks]
  2. 1(a)(ii)How do you account for the difference in the proportion of air in Samples A and B?[2 marks]
  3. 1(b)(i)What is the volume of water in EACH cylinder as shown in Figure 2? Cylinder 1: Cylinder 2:[2 marks]
  4. 1(b)(ii)Which measuring cylinder represents drainage from Sample B? Give a reason for your answer.[2 marks]
  5. 1(b)(iii)Calculate the volume of water retained by EACH sample of soil.[2 marks]
  6. 1(b)(iv)Identify ONE source of error in the investigation of soil drainage.[1 mark]
  7. 1(b)(v)Explain why it is important to investigate water retention properties of soils.[2 marks]
  8. 1(c)(i)Identify TWO features of the organisms observed in Figure 3 which could be used to classify them.[2 marks]
  9. 1(c)(ii)Name ONE group of soil organisms that is important in the recycling of soil nutrients.[1 mark]
  10. 1(c)(iv)a)List the apparatus you would need.[4 marks]
  11. 1(c)(iv)b)Describe the method you would use.[4 marks]
  12. 1(c)(v)a)Define the term 'carnivore'.[3 marks]
  13. 1(c)(v)b)Give TWO adaptations that Organism 6 should possess as a carnivore.[3 marks]

More practice: the rest of this paper · more Ecological Studies and Factors questions · all CSEC Biology past papers