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1 Q1. Scientists investigated the effects of temperature and light intensity on the rate of photosynthesis in creeping azalea. They investigated the effect of temperature on the net rate of photosynthesis at three different light intensities. They also investigated the effect of temperature on the rate of respiration. The graph shows the results. (a) (i) Name the factors that limited the rate of photosynthesis between X and Y. (1) Use information from the graph to explain your answer. Use information from the graph to find the gross rate of photosynthesis at 20 C and medium light intensity. Page 1
2 Answer... (1) (c) Creeping azalea is a plant which grows on mountains. Scientists predict that in the area where this plant grows the mean summer temperature is likely to rise from 20 C to 23 C. It is also likely to become much cloudier. Describe and explain how these changes are likely to affect the growth of creeping azalea. (3) (Total 7 marks) Q2. The graph shows the effects of light intensity on the rate of photosynthesis of three species of tree, X, Y and Z. Each of these species occurs at a different stage in succession. Page 2
3 (a) Species X is the first tree to become established in the succession. Use the graph to explain why it is likely to become established earlier in the succession than Y or Z. (3) Species X may change the environment so that it becomes more suitable for species Z. Use the graph to explain why. Page 3
4 (Total 5 marks) Q3. The table shows the effect of carbon dioxide concentration on the rate of photosynthesis of wheat. Carbon dioxide concentration/parts per million Rate of photosynthesis as net uptake of carbon dioxide per hour/mg dm (a) (i) The rate of photosynthesis is given as the net uptake of carbon dioxide. The true rate of photosynthesis is greater than this. Explain why. (1) Describe and explain the trend shown by the data in the table above a carbon dioxide concentration of 500 parts per million. Page 4
5 Scientists investigated the effect of temperature on the development of wheat plants. They calculated the mean temperature for the period and grew wheat plants over a range of 5 C around this temperature. The results of the investigation are shown in the graph. A rise in carbon dioxide concentration in the atmosphere could influence the yield and timing of the wheat harvest. Use the information from both the table and the graph to explain how. (4) (Total 7 marks) Page 5
6 Q4. An investigation was carried out into the effect of carbon dioxide concentration and light intensity on the rate of photosynthesis in a species of plant. (a) The temperature was kept constant during this investigation. Explain why. The table shows the effect of increasing carbon dioxide concentration on the rate of photosynthesis in maize. Carbon dioxide concentration / arbitrary units Rate of photosynthesis / arbitrary units Describe and explain the effect of increasing carbon dioxide concentration on the rate of photosynthesis. Page 6
7 (3) (Total 5 marks) Q5. An investigation was carried out to find the effect of increasing carbon dioxide concentration on the rate of photosynthesis in a particular type of plant. The graph shows the results. (a) (i) In this investigation, temperature was kept constant. Explain why. (1) Suggest suitable units for measuring the rate of photosynthesis in this investigation. (i) Give the evidence from the graph that carbon dioxide is limiting the rate of photosynthesis between A and B. Page 7
8 (1) Explain the shape of the curve between B and C. (Total 6 marks) Page 8
9 M1. (a) (i) Temperature and light; 1 Increase in temperature causes increase in rate of photosynthesis/uptake of carbon dioxide; Increase in light/more/medium/high light (intensity) causes increase in rate of photosynthesis/uptake of carbon dioxide; (mg g 1 hr 1 ) Accept answers in range (c) 1. Growth will decrease (at higher temperature); 2. Rate of respiration will increase at higher temperature; 3. Photosynthesis decreases as limited by light/as there is less light; Ignore references to effect of temperature on rate of photosynthesis 3 [7] M2. (a) Vegetation consists mainly of low growing species/herbs/annuals/no/ few trees; Species X has high rate of photosynthesis at high light intensity; Do not credit Species X is first tree Species X grow fastest at high rate of photosynthesis/at high light intensities; Will outcompete other species Y/Z; 3 max Produces shade/reduces light intensity; Page 9
10 Species Z grows best/photosynthesis best/in low light intensity/ Species Z does not grow well/low rate of photosynthesis in high light intensity; Accept answers in terms of CO2 absorption 2 [5] M3. (a) (i) Some carbon dioxide will be produced in respiration; Used in photosynthesis; 1 max Rate of increase of photosynthesis decreases/curve flattens; Something other than carbon dioxide concentration/temperature/ Light becomes limiting; Q answers which describe the rate of photosynthesis decreasing should not be awarded credit 2 Link establishes between carbon dioxide concentration, photosynthesis and yield of grain; Link established between carbon dioxide and global warming; As curve starting to flatten (at current carbon dioxide) concentrations Increase in yield may not be very large; Other factors/named factor linked to higher carbon dioxide concentration/temperature might have adverse effect; Harvest will be earlier as identified stages become shorter; Although not significant as already at higher temperatures; 4 max [7] M4. (a) Temperature affects photosynthesis; Affects enzyme activity; So that any change in photosynthesis rate is result of carbon dioxide/light intensity; max 2 Page 10
11 Carbon dioxide increases rate of photosynthesis; Up to max; Something else/correct suggestion is a limiting factor; 3 [5] M5. (a) (i) temperature also affects photosynthesis/ rate of reaction; need to ensure the effect of only one variable is being observed; 1 CO2 used/ O2 produced/ sugar produced/increase in mass; per unit of time; accept any volume or mass unit; per time unit;) (allow one mark for indicator of photosynthesis second mark is for time element) 2 (i) as carbon dioxide increases, rate of photosynthesis increases; 1 carbon dioxide not limiting photosynthesis; another factor/named factor limiting; explanation for named factor; 2 max [6] Page 11
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