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4 marksNutrition in Living Organisms

CSEC Biology · January 2005 · Paper 2 · Question 1(c)(iii)

What would you expect to happen if, at the end of the 10-minute period, the contents of Tubes A and E were brought to 30°C and then tested with iodine? Give ONE reason for your answer in EACH case.

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Other parts of this question

  1. 1(a)Complete the key beside Figure 1b to indicate the colours represented by the blackened and non-blackened circles.[2 marks]
  2. 1(b)(i)Explain why the colour of the drops remained the same for the 10 minutes in row A and row E.[4 marks]
  3. 1(b)(ii)What substance would you expect to find in Tube D after 2 minutes?[1 mark]
  4. 1(b)(iii)Describe the test that could be carried out to find out if you were correct at (b)(ii) above.[2 marks]
  5. 1(c)(i)Using information from the experiment in Figures 1a and 1b, complete the graph below to show the effect of temperature on the time taken for the reaction…[3 marks]
  6. 1(c)(ii)At what temperature did the reaction take place most rapidly?[1 mark]
  7. 1(d)(i)Use the information on page 2 to describe the procedure used to set up this investigation, by placing each step in the correct order in which it should be…[5 marks]
  8. 1(d)(ii)Explain the importance of stirring the mixture.[1 mark]
  9. 1(e)(i)How should the cotyledons be prepared for testing?[1 mark]
  10. 1(e)(ii)Explain what happens to the starch stored in the cotyledons when the seed germinates.[3 marks]
  11. 1(f)(i)Explain the appearance of the seedlings in Figure 1c.[2 marks]
  12. 1(f)(ii)If you are asked to set up an investigation in a laboratory to show that your explanation in (f)(i) is correct and all you have is an old shoe box, how would…[1 mark]

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