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Trying Is Better Than Crying Essay

1198 words - 5 pages

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level

* 7 4 8 7 5 2 9 1 0 5 *

BIOLOGY Paper 3 Practical Test Candidates answer on the Question Paper. Additional Materials: As specified in the Confidential Instructions.

5090/32
May/June 2013 1 hour 15 minutes

READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black ink. You may use a soft pencil for any diagrams, graphs or rough working. Do not use red ink, staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. At the end of the examination, ...view middle of the document...

................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ...................................................................................................................................... [3] You are provided with a length of soaked tubing that has been securely tied at one end. You are provided with a solution of starch and glucose, labelled A. • Using a pipette or small syringe, fill the tubing with solution A to a depth of approximately 5 cm. It may be helpful to support the tubing in a large empty test-tube whilst filling it. Rinse the outside of the tubing with water from the beaker labelled ‘rinsing water’.

© UCLES 2013

5090/32/M/J/13

3 • Put this tubing into a clean large test-tube. Use a clip or peg to attach the top of the tubing containing solution A to the top of the large test-tube. Pour clean water from the beaker labelled ‘clean water’ into the large test-tube to the level shown in Fig. 1.1. Support this large test-tube in a beaker. Immediately remove 1 cm3 of water from the large test-tube and test it for reducing sugar. Record the time shown on the clock in Table 1.1. This is start time. Remove a drop of water from the large test-tube now and test it on a clean white tile for starch. Keep these samples until later.
For Examiner’s Use

• •

(b) Enter your observations and conclusions for the reducing sugar test and the starch test in Table 1.1 for time 0 mins, start time. Table 1.1 clock time

time / mins

reducing sugar test

starch test

observation .............................. 0 conclusion ................................

.............................................. ..............................................

observation .............................. 20 conclusion ................................

.............................................. ..............................................

Leave the experiment for 20 minutes. Begin Question 2 while you wait. • After 20 minutes, repeat the same tests for reducing sugar and starch on a new sample of the water taken from the large test-tube surrounding the tubing. Remember to use clean pipettes each time. Record the clock time, your observations and conclusions in Table 1.1. [4]

© UCLES 2013

5090/32/M/J/13

[Turn over

4 (c) Suggest and explain what has happened during the 20 minutes to produce these results. .............................................................................................................................................

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