Zadanie 1a
Outline how a calibrated eyepiece graticule could be used to determine the actual thickness of a tissue layer.
Biology HL Paper 1B, May 2025, TZ1
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 15 zadań z tego arkusza, razem 31 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: DNA packaging around histones (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
State one structural or chemical defence a plant can use against a grazing animal.
Zadanie 1c
Explain two leaf adaptations that reduce the difficulties of surviving in a hot desert.
Zadanie 2a
(i) Using the model, identify the molecule in the outer region and give a reason for your identification. (ii) Describe the molecular structure of the core.
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Zadanie 2b
Suggest why the chromosome of Escherichia coli is not packaged into nucleosomes of this type.
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Zadanie 2c
Explain how comparing DNA can help construct a cladistic classification.
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Zadanie 3a
(i) Identify one independent variable in this investigation. (ii) State one other variable that should be controlled.
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Zadanie 3b
Compare and contrast how increasing the concentrations of K1 and K2 affects mean enzyme activity.
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Zadanie 3c
Outline how the enzyme’s reaction rate could be calculated from suitable measurements.
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Zadanie 3d
Distinguish between competitive inhibition and pure non-competitive inhibition.
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Zadanie 3e
Describe the contribution of enzymes to one named human defence process that prevents infection.
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Zadanie 4a
(i) Estimate the median female height in the later cohort. (ii) Estimate the maximum male height in the earlier cohort. (iii) State why several observations are shown as separate points beyond the whiskers.
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Zadanie 4b
Using these data, discuss the hypothesis that human height is determined by polygenic inheritance.
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Zadanie 4c
Compare and contrast directional selection and disruptive selection acting on a continuously variable trait.
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Zadanie 4d
Discuss the usefulness and limitations of the Hardy–Weinberg model in population genetics.
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