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2 marksEcological Studies and Factors

CSEC Biology · May/June 2008 · Paper 2 · Question 1(b)(v)

The student further investigated the soil by pouring 100 cm³ of water on each soil sample (A and B). The drained water was collected in measuring cylinders, as shown in Figure 2.

Explain why it is important to investigate water retention properties of soils.

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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(c)(i)Identify TWO features of the organisms observed in Figure 3 which could be used to classify them.[2 marks]
  8. 1(c)(ii)Name ONE group of soil organisms that is important in the recycling of soil nutrients.[1 mark]
  9. 1(c)(iii)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.[2 marks]
  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