Zadanie 1a
Calculate the difference in mean examination time between prey scent alone and the mixed scent.
- Materiał graficzny
Biology HL Paper 2, Specimen 2025
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 28 zadań z tego arkusza, razem 94 punkty, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (4), Evaluating biological evidence and methods (4), Biological calculations, statistics and graphs (2).
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Dodaj cały arkusz do zestawuZadanie 1b
Outline conclusions supported by the water-paper controls.
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Zadanie 1c
Outline why paper positions should change between trials.
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Zadanie 1d
Suggest why coating prey fur with predator scent might reduce attack risk.
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Zadanie 1e
Compare and contrast the strike probabilities towards displaying and non-displaying prey.
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Zadanie 1f
Estimate the distance at which displaying prey has a 50% chance of receiving a strike.
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Zadanie 1g
Suggest why a snake might avoid striking displaying prey.
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Zadanie 1h
State the conditions producing the smallest mean number of look-ups.
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Zadanie 1i
Discuss briefly whether bird chatter produces a statistically significant difference in vigilance immediately after the raptor call.
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Zadanie 1j
Using both bar charts, analyse how bird chatter affects behaviour after the alarm.
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Zadanie 2a
State two membrane-bound organelles found in both typical plant and animal cells.
Zadanie 2b
(i) State one organelle characteristic of plant cells but absent from typical animal cells. (ii) State one organelle present in both prokaryotic and eukaryotic cells.
Zadanie 3a
(i) Annotate the diagram with an arrow showing net auxin transport through the cell. (ii) Identify an environmental stimulus that can alter carrier distribution.
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Zadanie 3b
(i) Predict a visible difference between shoot meristem-derived cells grown with a growth-promoting auxin concentration and cells grown without it. (ii) State another hormone that interacts with auxin to coordinate shoot growth.
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Zadanie 4a
Describe how gases move between alveolar air and blood.
Zadanie 4b
Describe two features shared by the exchange surfaces in alveoli and gills.
Zadanie 5a
Suggest how predation could benefit the rabbit population.
Zadanie 5b
Outline factors that limit the sustainable size of the prey population.
Zadanie 5c
(i) Outline how mark–release–recapture could estimate the rabbit population size. (ii) State one assumption needed for this estimate.
Zadanie 6a
Outline the usual chromosomal determination of sex in humans.
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Zadanie 6b
Explain how meiotic non-disjunction can produce a zygote with trisomy 21.
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Zadanie 6c
Explain what evidence in the pedigree is consistent with sex-linked inheritance.
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Zadanie 7a
Identify the recombinant phenotypes.
Zadanie 7b
Explain whether the observations fit the Mendelian prediction for independent assortment in this cross.
Zadanie 7c
Outline a statistical test that could provide further evidence about the inheritance pattern.
Zadanie 8
Specific molecular interactions occur in several biological systems. (a) Explain how a vaccine can produce specific immunity against a viral infection. (b) Outline how membrane proteins control movement of particular ions at different stages of a nerve…
Zadanie 9
Some environmental contaminants interfere with biological processes. (a) Describe how a persistent fat-soluble pesticide can become concentrated in predatory birds. (b) Compare and contrast competitive and non-competitive inhibition of enzymes. (c) Outline…
Zadanie 10
DNA structure and sequence affect biological function. (a) Outline how ultraviolet radiation can act as a mutagen. (b) Explain links between DNA molecular structure and its functions. (c) Describe how gene knockout is used in research. One additional mark is…