Biology A2
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level
* 2 3 0 8 9 6 9 9 7 3 *
BIOLOGY Paper 5 Planning, Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. 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 pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.
9700/51
October/November 2011 1 hour 15 minutes
For Examiner’s Use 1 2 Total
This document consists of 8 printed pages.
DC (CB (SE/DJ)) 34786/4 © UCLES 2011
[Turn over
2 1 Photosynthesis was investigated in a species of unicellular alga using the apparatus shown in Fig. 1.1. suspension of unicellular algae in water
For Examiner’s Use
10.0 light of known wavelength oxygen probe magnetic stirrer Fig. 1.1 Two different strains of the species of alga were tested using a range of different wavelengths of light. • • Light of known wavelength was passed through the tube containing algae for two hours. The light transmission through the suspension and the oxygen concentration were then measured. light meter oxygen meter
The results were used to plot the absorption spectrum and the action spectrum for each strain of alga. Fig.1.2 shows these spectra. strain A strain B absorbance absorption spectra
400
500 600 700 wavelength of light / nm
rate of photosynthesis
action spectra
400
500 600 700 wavelength of light / nm
Fig. 1.2
© UCLES 2011 9700/51/O/N/11
3 (a) (i) State the two dependent variables in this investigation. 1.
* 2 3 0 8 9 6 9 9 7 3 *
BIOLOGY Paper 5 Planning, Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. 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 pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.
9700/51
October/November 2011 1 hour 15 minutes
For Examiner’s Use 1 2 Total
This document consists of 8 printed pages.
DC (CB (SE/DJ)) 34786/4 © UCLES 2011
[Turn over
2 1 Photosynthesis was investigated in a species of unicellular alga using the apparatus shown in Fig. 1.1. suspension of unicellular algae in water
For Examiner’s Use
10.0 light of known wavelength oxygen probe magnetic stirrer Fig. 1.1 Two different strains of the species of alga were tested using a range of different wavelengths of light. • • Light of known wavelength was passed through the tube containing algae for two hours. The light transmission through the suspension and the oxygen concentration were then measured. light meter oxygen meter
The results were used to plot the absorption spectrum and the action spectrum for each strain of alga. Fig.1.2 shows these spectra. strain A strain B absorbance absorption spectra
400
500 600 700 wavelength of light / nm
rate of photosynthesis
action spectra
400
500 600 700 wavelength of light / nm
Fig. 1.2
© UCLES 2011 9700/51/O/N/11
3 (a) (i) State the two dependent variables in this investigation. 1.