| Date | November 2021 | Marks available | 1 | Reference code | 21N.1.HL.TZ1.8 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 8 | Adapted from | N/A |
Question
In 1882, Engelmann investigated photosynthesis by shining light of varying wavelength on a green alga. He observed where aerobic bacteria accumulated.
[Source: Republished with permission of Oxford University Press, from Plant Physiology and Development, Sixth Edition by
Lincoln Taiz, Eduardo Zeiger, Ian M. Møller, and Angus Murphy, 2015. Permission conveyed through Copyright
Clearance Center, Inc.]
What can be deduced from this experiment?
A. Only parts of the chloroplast contained chlorophyll.
B. The distribution of bacteria indicates the action spectrum of photosynthesis.
C. Most oxygen is released from the algae in green light.
D. Chloroplasts reflect blue and red light.
Markscheme
B
Examiners report
A G2 comment suggested that this question would take too long to answer, but the statistics showed that students did not find it difficult.
Syllabus sections
- 22M.2.HL.TZ2.6b: The processes of photosynthesis and respiration have some factors in common and others...
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22M.1.SL.TZ2.12:
The apparatus shown was used to investigate the effect of varying carbon dioxide concentration on the rate of photosynthesis. Carbon dioxide concentrations were varied by adding different amounts of sodium hydrogen carbonate (NaHCO3) to water.
What is the dependent variable in this investigation?
A. Temperature
B. Light intensity
C. Amount of NaHCO3 added
D. Volume of oxygen produced
- 17N.3.SL.TZ0.02a: Identify pigment labelled P.
- 17M.3.SL.TZ1.2b: C. caroliniana can grow well in water at 27°C. This experiment was carried out at...
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17N.3.HL.TZ0.01a:
Outline what happens when spinach extract is spotted on a TLC plate and placed into a container of solvent.
- 17M.3.HL.TZ1.3a: Suggest a hypothesis for the trend in the graph.
- 18M.3.SL.TZ2.1c.ii: Porphyra also contains phycoerythrin, which is a red pigment. Predict one colour of light...
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16N.2.SL.TZ0.7b:
Producers extract phosphates and nitrates from soil. Outline how these ions are used in the synthesis of organic molecules.
- 18N.3.SL.TZ0.1c.i: Using the axes, sketch the action spectrum for photosynthesis in the green area of the leaf...
- 18M.3.SL.TZ2.1c.i: Porphyra also contains phycoerythrin, which is a red pigment. Suggest a reason for...
- 18N.3.SL.TZ0.1b.ii: Identify which two areas, W, X, Y or Z, in Figure 4 show that chlorophyll is required for...
- 22M.1.SL.TZ1.12: The graph shows how the rate of photosynthesis of a green plant varies with CO2 concentration...
- 18N.2.HL.TZ0.4e.i: The boreal forests are situated close to the north pole and even in summer the intensity of...
- 18N.3.SL.TZ0.1d: Suggest reasons that plants with variegated leaves are rarely found growing wild naturally.
- 18N.3.SL.TZ0.1a: Outline a reason for inhibiting photosynthesis for 24 hours.
- 18N.3.SL.TZ0.1c.ii: Predict how the action spectrum from the white areas of the leaf would differ from the green...
- 18N.1.HL.TZ0.10: What are final products of photosynthesis and of aerobic respiration?
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17N.3.SL.TZ0.02c:
Explain how the pigments in the chromatogram of spinach are identified.
- 20N.1.SL.TZ0.12: Plants produce carbon dioxide in respiration and use carbon dioxide in photosynthesis. The...
- 18N.3.SL.TZ0.1b.i: Identify which two areas, W, X, Y or Z, in Figure 4 show that light is required for...
- 18N.1.SL.TZ0.11: The graph shows the relationship between rate of photosynthesis and light intensity as...
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19M.1.SL.TZ1.12:
The graph shows the effect of increasing light intensity on the rate of CO2 uptake by a species of green plant maintained in conditions of constant temperature and CO2 concentration.
[Source: © International Baccalaureate Organization 2019]
Which statement is consistent with the graph?
A. Photosynthesis stops at high light intensity.
B. Rates of photosynthesis increase with temperature.
C. Cell respiration leads to net production of CO2 at low light intensity.
D. There is a negative correlation between CO2 uptake and light intensity.
- 19M.1.HL.TZ1.9: Which wavelength of electromagnetic radiation is absorbed efficiently by chlorophyll for...
- 17N.1.SL.TZ0.19: An experiment was set up so that each test tube contained water at a pH of 6.3 and a pH...
- 17M.3.SL.TZ1.2c: This experiment measured the quantity of oxygen gas released by the water plant. State one...
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16N.2.SL.TZ0.3b:
Identify the following processes as either anabolism or catabolism by placing a tick (√) in the correct box.
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 18M.3.SL.TZ2.1b: Compare and contrast absorption spectra and action spectra.
- 18M.3.SL.TZ2.1a: Identify a pigment found in all three organisms.
- 21N.1.SL.TZ0.8: What prevents plants from converting carbon dioxide into glucose in the dark? A. They do not...
- 19N.2.HL.TZ0.4b.i: State the name of this process.
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19M.2.SL.TZ2.6b:
Outline how photosynthesis produces glucose.
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17N.3.HL.TZ0.01c:
State two photosynthetic pigments that could be identified using chromatography.
- 18M.2.SL.TZ1.4c: Outline the role of plant pigments in the process of photosynthesis.
- 17M.1.SL.TZ2.11: What is the relative wavelength in the visible spectrum of red light and blue light and are...
- 17M.1.SL.TZ2.12: The fungus Rhytisma grows on the leaves of certain trees, causing a yellow leaf area in which...
- 21M.1.SL.TZ1.16: If a plant is exposed to light, which colour of light would lead to the lowest rate of oxygen...
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
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19M.1.SL.TZ2.11:
The graph shows the absorption spectra of chlorophyll a and chlorophyll b.
[Source: adapted from F. P. Zscheile and C. L. Comar, 'Influence of Preparative Procedure on the Purity of Chlorophyll
Components as Shown by Absorption Spectra.' Int. J. Plant Sciences, Volume 102, Number 3, Mar., 1941, pp. 463–481.
Used with the kind permission of University of Chicago Press.]What can be concluded from the graph?
A. Both chlorophyll a and chlorophyll b absorb a large amount of green light
B. Chlorophyll b absorbs red light more efficiently than blue light
C. Other pigments must absorb light between blue and red in the spectrum
D. Chlorophyll a and chlorophyll b have different absorption peaks
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22M.2.SL.TZ1.6b:
Describe how leaf cells make use of light energy.
- 17M.3.SL.TZ1.2a: Compare and contrast the experimental results for the effect of light intensity on the rate...
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20N.3.SL.TZ0.3c:
Suggest how a plastic bag placed around the plant pot prevents carbon dioxide from reaching the plant’s leaves.
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17N.2.SL.TZ0.07b:
Explain the process of photosynthesis.
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17N.3.HL.TZ0.01b:
Explain what the Rf values represent in chromatography.
- 21M.2.SL.TZ1.2a.i: Identify the process Y and state the name of the organelle where it takes place in a plant...
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21N.2.HL.TZ0.1c:
Explain the effect of temperature on the rate of photosynthesis in this mesocosm.
- 21M.1.SL.TZ2.12: What does the Rf value in thin layer chromatography represent? A. The distance travelled by...
- 19M.2.HL.TZ2.8b: Draw a fully labelled graph of the action spectrum for photosynthesis.
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20N.3.SL.TZ0.3d:
A chromatograph was made of the photosynthetic pigments of a leaf of the plant.
[Source: Adapted from “Diversity of Photosynthetic Pigments” by Alexander F. Motten in Tested Studies for
Laboratory Teaching, Volume 16 of the Association for Biology Laboratory Education and used by permission of the
author.]Outline what measurements would be taken to identify pigment X.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
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21N.2.SL.TZ0.3c:
The amount of food passing into food chains can be affected by the rate of photosynthesis. Explain the effect of one limiting factor on photosynthesis.
- 20N.2.SL.TZ0.5b: Outline how carbon compounds are produced in cells using light energy.
- 19N.1.HL.TZ0.9: Some photosynthesis experiments require water that is free of carbon dioxide. What is the...
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17N.3.SL.TZ0.02b:
State a suitable solvent for extracting photosynthetic pigments from plant tissue.
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
- 22M.1.HL.TZ2.7: What does an action spectrum for photosynthesis show? A. The range of conditions over which...
- 19M.2.SL.TZ1.8c: Explain how plants capture and use light in photosynthesis.
- 17M.2.SL.TZ2.6b: Outline the production of carbohydrates in photosynthesis.
- 19N.2.HL.TZ0.4b.ii: Explain how water is used in photosynthesis.
- 21M.2.SL.TZ1.2d: Outline the uses of ATP in plant cells.
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18N.3.SL.TZ0.1b.iii:
Discuss briefly whether the detection of starch in this experiment was proof that photosynthesis had occurred in the leaf.
