Zadanie 1a
Suggest one reason for excluding HIV-infected children when estimating deaths attributable to R and S.
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Biology HL Paper 2, 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 24 zadania z tego arkusza, razem 78 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (5), Evaluating biological evidence and methods (4), Structures of an insect-pollinated flower (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
(i) Identify the percentage receiving vaccine A in year 33. (ii) Calculate the interval between vaccine D reaching 40% coverage and vaccine R reaching 40%.
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Zadanie 1c
Outline conclusions from the panel for bacterium R.
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Zadanie 1d
Suggest reasons for the different patterns for R and S.
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Zadanie 1e
Using the violin plots, deduce which age range has a larger fraction of ARI attributable to R.
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Zadanie 1f
Suggest reasons for the difference between the fractions attributed to R in all ARI cases and in antibiotic-treated cases.
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Zadanie 1g
With no vaccination, the lower-middle-income category has more treated cases than either other category. Suggest one explanation.
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Zadanie 1h
Use the estimates to predict the effect of universal vaccination against R across the combined group.
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Zadanie 1i
Outline likely health benefits of universal vaccination against R other than a reduced incidence of ARI.
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Zadanie 2a
Identify the biochemical group shared by arginine and ornithine.
Zadanie 2b
Outline one feature distinguishing a metabolic cycle from a linear pathway.
Zadanie 2c
Predict the effect of the enzyme arginase on the reaction’s activation energy.
Zadanie 2d
A model sample contains 24 mg urea per 100 mL of plasma but 1440 mg per 100 mL of final urine. Explain how the kidney produces this concentration increase.
Zadanie 3a
State the name and function of structures I and II.
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Zadanie 3b
Structure III is the ovary. Outline processes occurring within it or during its development.
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Zadanie 3c
Structure IV secretes a sugar-rich liquid. Suggest a benefit of this secretion to the plant.
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Zadanie 4a
(i) State, with a reason, whether this animal is autotrophic or heterotrophic. (ii) Explain what information is needed to determine its trophic level.
Zadanie 4b
(i) State the chromosome number in a gamete. (ii) State the number of autosomes in a somatic cell.
Zadanie 5a
Explain how the difference in molecular polarity contributes to the thermal-property differences.
Zadanie 5b
Use the supplied data to deduce why ethane is a gas at ordinary temperatures in human-inhabited environments.
Zadanie 5c
Using the data, explain why ethane would be less suitable than water for evaporative cooling at the skin.
Zadanie 6
(a) Explain how changes in regulation of the cell cycle can lead to a tumour. (b) Outline the role of the right atrium during the cardiac cycle. (c) Describe carbon-cycle processes that release or consume carbon dioxide.
Zadanie 7
(a) Describe protein structure, distinguishing shared features from features that can vary. (b) Explain how proteins enable substances to move across cell membranes.
Zadanie 8
(a) Outline how fruit-fly crosses can investigate inheritance and what such experiments can reveal. (b) Describe methods used in cladistics and uses of the resulting evidence.