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Practice past paper questions for Topic: Photosynthesis
- Institution
- AQA
**AQA Exam questions for photosynthesis inc mark scheme** **B R AN D N E W**
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Photosynthesis booklet revision questions NAME:Q1.
A student investigated the effect of different wavelengths of light on the rate of
photosynthesis. She used the apparatus shown in Figure 1.
Figure 1
(a) What measurements should the student have taken to determine the rate of
photosynthesis?
___________________________________________________________________
___________________________________________________________________
(1)
(b) Other than temperature and pH, give two factors which should be kept constant
during this investigation.
1. _________________________________________________________________
2. _________________________________________________________________
(2)
(c) The student did not use a buffer to maintain the pH of the solution.
Explain what would happen to the pH of the solution during this investigation.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
(2)
Page 1 of 24
, (d) Figure 2 shows the student’s results.
Figure 2
Suggest and explain why the rate of photosynthesis was low between 525 nm and
575 nm wavelengths of light.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
________________________________________________________________ (2)
(Total 7 marks)
Q2.
The diagram shows the light-dependent reactions of photosynthesis.
Page 2 of 24
, (a) In which part of a chloroplast do the light-dependent reactions occur?
________________________________________________________________ (1)
(b) Name the substances in boxes A, B and C.
A ________________________________
B _______________ + _______________
C ________________________________ (3)
(c) Use information in the diagram to explain
(i) the role of chlorophyll in photolysis;
______________________________________________________________
______________________________________________________________
______________________________________________________________
____________________________________________________________ (3)
(ii) how the energy of light is converted into chemical energy in the
light-dependent reactions.
______________________________________________________________
______________________________________________________________
______________________________________________________________
____________________________________________________________ (3)
(d) In an investigation, single-celled algae were kept in bright light and were supplied
with carbon dioxide containing radioactive carbon atoms. After 300 seconds, the
carbon dioxide supply was turned off. The graph shows how the concentrations of
carbon dioxide, glycerate 3-phosphate (GP) and ribulose bisphosphate (RuBP)
changed.
Page 3 of 24
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