6.1. Photosynthesis
A subsection of Biology, 0610, through 6. Plant nutrition
Listing 10 of 307 questions
Use shows the apparatus used in an investigation. black box to exclude light hydrogencarbonate indicator (pink/red at start) pond weed sunlight sunlight fresh water shrimp A C B D Complete Table 4.1 to show whether photosynthesis and respiration are happening in each tube. Table 4.1 tube contents and conditions photosynthesis happening respiration happening A pond weed in dark B pond weed in bright light C fresh water shrimp in dark D fresh water shrimp in bright light Examiner's Use Hydrogencarbonate indicator changes colour according to the pH of the contents of each tube, as shown in the pH chart in . pH pink/red colour of hydrogencarbonate indicator golden yellow purple The apparatus, shown in , was left for several hours. Complete Table 4.2 by predicting the colour of the indicator in each of the four tubes. Table 4.2 tube contents and conditions colour of hydrogencarbonate indicator after several hours A pond weed in dark B pond weed in bright light C fresh water shrimp in dark D fresh water shrimp in bright light Explain your predictions, stated in Table 4.2, for the colours of the hydrogencarbonate indicator in each of the tubes.
0610_w05_qp_2
THEORY
2005
Paper 2, Variant 0
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For Examiner's Use A student set up the apparatus shown in to investigate the effect of light intensity on the rate of photosynthesis of a pond plant. movable lamp glass tank with water gas collects here test-tube pond plant syringe scale / mm air bubble in capillary tube ruler movement of air bubble stop-clock The student maintained the temperature at 20 oC and measured the distance travelled by the air bubble in the capillary tube for a period of five minutes on three occasions for each light intensity. The student’s results are shown in Table 3.1 on page 8. For Examiner's Use Explain why the student included the glass tank and the syringe in the apparatus. glass tank syringe Explain why the air bubble moves down the capillary tube. For Examiner's Use Table 3.1 distance of lamp from pond plant / mm distance travelled by air bubble / mm rate of photosynthesis / mm per minute 6.0 5.2 2.8 0.6 Calculate the rate of photosynthesis when the lamp was 50 mm from the pond plant and write your answer in the table. rate of photosynthesis / mm per minute distance / mm For Examiner's Use Plot the student’s results from Table 3.1 on the axes on . Draw an appropriate line on the graph to show the relationship between distance of the lamp from the pond plant and the rate of photosynthesis. Using the graph to help you, predict the results that the student would get if the lamp was positioned 15 mm and 70 mm from the pond plant. 15 mm mm per minute 70 mm mm per minute Explain why the rate of photosynthesis decreases as the distance of the lamp from the pond plant increases.
0610_w09_qp_31
THEORY
2009
Paper 3, Variant 1
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Questions Discovered
307