Zadanie 1a
State the effect of immobilization on activity in this experiment.
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Biology HL Paper 3, May 2023, 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 44 zadania z tego arkusza, razem 70 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Evaluating biological evidence and methods (12), Recording and interpreting biological data (9), Planning a biological investigation (8).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Identify one variable to hold constant when comparing activity across temperatures.
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Zadanie 1c
Evaluate the reliability of the activity results.
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Zadanie 1d
Describe how to extend the investigation to locate the optimum temperature of immobilized catalase more precisely.
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Zadanie 2a
Outline the purpose of initially boiling the broth.
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Zadanie 2b
Describe how a control is provided.
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Zadanie 2c
Explain the conclusions supported by the final observations.
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Zadanie 3a
Suggest why the reservoir needs a vented lid.
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Zadanie 3b
Explain the difference in water-loss rate between light and dark periods.
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Zadanie 3c
Describe a treatment that could help identify which shoot parts lose water.
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Zadanie 3d
Explain how the two-balance apparatus distinguishes water uptake from water loss.
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Zadanie 4
A neuroscience team compares ways to investigate the roles of different brain regions. Suggest one advantage of an appropriately designed animal experiment over a comparable invasive experiment in humans.
Zadanie 6a
Using the graph, state how the presence of functional transporter alleles affects the measured dopamine level.
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Zadanie 6b
Describe how stimulant drugs can affect nervous-system activity.
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Zadanie 7a
Suggest why adults consume some very large prey but do not eat the intermediate-size prey.
Zadanie 7b
Explain how a food-provisioning behaviour of this kind could evolve.
Zadanie 8
During a cycling exercise test, a participant’s ventilation increases as metabolic activity rises. Explain how the brain controls breathing.
Zadanie 9
A vessel is used to grow microorganisms that produce a useful substance. State one physical or chemical condition to keep at an appropriate constant value to support production.
Zadanie 10
Cut pear tissue normally darkens when oxygen is available because a polyphenol-oxidizing enzyme converts colourless compounds to pigments. A modified line shows no darkening under the same conditions. Suggest why the modified tissue does not darken.
Zadanie 11a
State one function that the extracellular polymeric material could perform.
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Zadanie 11b
Describe emergent properties of the mature community, excluding production of EPS.
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Zadanie 12
Two tissue samples are processed as shown. Outline why different synthetic dyes are attached to the two DNA samples.
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Zadanie 13a
Suggest why the corresponding DNA sequences could differ more than these amino-acid sequences.
Zadanie 13b
Describe how sequence alignment can be used to infer relationships between species A and the other mammals.
Zadanie 15a
Identify the trophic level occupied by the lizard.
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Zadanie 15b
Outline the additional measurements needed to construct an energy pyramid for this web.
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Zadanie 15c
Outline why the owl is difficult to allocate to a single tier of an energy pyramid.
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Zadanie 16a
Outline how plant P could become an ecological problem.
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Zadanie 16b
Explain the overall changes in insect H abundance during the study.
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Zadanie 16c
Discuss a possible benefit and a possible risk of introducing a biological control organism.
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Zadanie 17a
Suggest one cause of habitat loss for birds.
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Zadanie 17b
Outline how in situ conservation can help amphibian populations.
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Zadanie 17c
Distinguish species richness from species evenness.
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Zadanie 18a
Mark P on the horizontal axis at the fishing effort giving the greatest sustainable yield.
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Zadanie 18b
Outline why yield falls in region III.
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Zadanie 18c
Suggest why maintaining globally sustainable fishing effort is difficult.
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Zadanie 18d
Explain how capture–mark–release–recapture could estimate the fish population in a small lake.
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Zadanie 20a
Compare and contrast the association between cholesterol and CHD incidence in men and women.
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Zadanie 20b
Suggest why a high total cholesterol measurement alone may not determine a person’s CHD risk.
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Zadanie 22a
Calculate the duration for which all four chambers are simultaneously in diastole.
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Zadanie 22b
Describe the state of the atrioventricular and semilunar valves at 0.25 s.
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Zadanie 22c
Explain adaptations of cardiac muscle to its function.
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Zadanie 23a
State where blood would normally be flowing at the point marked X.
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Zadanie 23b
Outline why the fetal curve lies to the left of the normal adult curve.
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