Zadanie 1a
A laboratory compares solutions used to maintain mammalian sperm samples. Define osmolarity.
Biology SL Paper 3, May 2023, TZ2
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 29 zadań z tego arkusza, razem 50 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Evaluating biological evidence and methods (8), Recording and interpreting biological data (7), Planning a biological investigation (7).
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Dodaj cały arkusz do zestawuZadanie 1b
A model dataset relates the osmolarity of fluid surrounding mammalian sperm to the fraction of moving sperm. (i) State the relationship shown. (ii) Blood plasma has a lower osmolarity than seminal fluid in the model. Explain the expected direction of water…
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Zadanie 1c
A model dataset relates the osmolarity of fluid surrounding mammalian sperm to the fraction of moving sperm. Explain one change expected if these sperm are transferred to a hypotonic solution.
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Zadanie 2a
A digestive enzyme is tested at different environmental conditions. Outline the effect of low temperature on its activity.
Zadanie 2b
Identify an independent variable and the dependent variable.
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Zadanie 2c
Explain how changes in pH affect the female protease preparation.
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Zadanie 3a
State one variable to standardize when setting up the tanks.
Zadanie 3b
Suggest one reason for covering tanks with mesh.
Zadanie 3c
Outline an advantage of seven replicates per treatment.
Zadanie 3d
Explain advantages of these mesocosms compared with manipulating a natural pond.
Zadanie 5
Several regions of the brain contribute to automatic body functions. Identify one function controlled by the medulla oblongata.
Zadanie 6a
Comment on the claim that some complex skills are learned more readily early in life, using the data.
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Zadanie 6b
State one method other than post-mortem examination for investigating the function of brain regions.
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Zadanie 8
Sensory cells register movement of the head. Identify the receptor class involved.
Zadanie 9
A model screening experiment compares bacterial growth on agar with and without a test substance. Outline how to carry out this experiment.
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Zadanie 10
Deduce whether the gel supports successful transformation, giving a reason.
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Zadanie 11a
A crop line is resistant to a herbicide used against weeds in the same field. Outline one benefit of cultivating the resistant crop.
Zadanie 11b
In a model region, cultivation of herbicide-resistant crops expanded during the period shown. The chart records the cumulative number of weed species reported resistant to that herbicide. Comment on environmental consequences of widespread use of these crops.
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Zadanie 12
Water, sediment and material scraped from rock biofilms are sampled at two river locations. E. coli is a faecal bacterium. Standardized sample preparations are compared, with variability shown by error bars. (i) Suggest a reason for the difference between the…
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Zadanie 13a
Reef-building coral polyps contain photosynthetic algal partners within their tissues. Describe the relationship between the two organisms.
Zadanie 13b
A model heating experiment measures oxygen production by the algal partners and oxygen consumption by the association. In this model, visible bleaching occurs above 33.5°C. (i) Distinguish the temperatures at which further warming begins to reduce the two…
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Zadanie 14a
Describe two factors that could limit this ecosystem.
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Zadanie 14b
New mineral ground in a cold northern valley is gradually colonized by plants. Much of the subsoil remains frozen throughout the year. Outline processes that can increase soil depth over time.
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Zadanie 15a
Compare the species richness of the plots.
Zadanie 15b
Explain what the diversity-index values indicate about these ecosystems.
Zadanie 16a
A constructed marine survey compares hydrophobic PCB pollutants in organisms. Error bars represent variability among samples. (i) Suggest why mussels have a mean trophic level between 2 and 3. (ii) Predict one possible consequence if orcas disappear from this…
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Zadanie 16b
A constructed marine survey compares hydrophobic PCB pollutants in organisms. Error bars represent variability among samples. Explain why PCB concentrations can become much greater at higher trophic levels.
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Zadanie 17
The schematic represents an absorptive cell in the intestinal lining. Describe how the structures marked X support this cell’s function.
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Zadanie 20
A diet provides very little fat over an extended period. Suggest one possible resulting problem.