Zadanie 1a
A student examines a broad-bean root tip with a light microscope. State the measuring accessory needed to determine a cell’s actual length.
Biology SL Paper 1B, May 2025, TZ3
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 14 zadań z tego arkusza, razem 24 punkty, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (2), Planning a biological investigation (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
A root-tip cell contains a nucleus. Draw and label the structure of a typical eukaryotic nucleus.
Zadanie 2a
State the direction of net water movement across the membranes during the first three minutes.
- Materiał graficzny
Zadanie 2b
(i) Distinguish the volume changes in the mRNA-treated cells from those in the controls. (ii) Explain how the introduced aquaporins produce this difference.
- Materiał graficzny
Zadanie 2c
Outline why relative volumes are more useful here than unadjusted cell volumes.
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Zadanie 2d
Comment on how well the reliability of the results can be assessed.
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Zadanie 3a
A field team investigates ticks in a fenced area of rough grassland. Outline how capture–mark–release–recapture could estimate their population size.
Zadanie 3b
A teaching model considers a hypothetical vaccine against a tick-borne bacterium. The graph shows a volunteer’s concentration of antibodies specific to this bacterium before vaccination at day zero. (i) Suggest what the measurements before day zero indicate…
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Zadanie 3c
A tick-borne infection can affect the human central nervous system. Name the two principal parts of this system.
Zadanie 4a
Identify the independent variable represented by the three treatment groups.
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Zadanie 4b
State one other variable to keep constant.
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Zadanie 4c
Explain the relationship between storage temperature and remaining enzyme activity.
- Materiał graficzny
Zadanie 4d
State how the graph allows the consistency of repeated measurements to be assessed.
- Materiał graficzny
Zadanie 4e
Describe how a change in pH could be used to measure the rate of oil digestion by lipase.
- Materiał graficzny