Zadanie 1
An isolated mammalian muscle cell is transferred from its usual medium to a hypotonic medium. Explain the changes expected in the cell.
Biology HL Paper 3, 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 42 zadania z tego arkusza, razem 85 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (12), Evaluating biological evidence and methods (10), Planning a biological investigation (6).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 2a
(i) State one variable to keep constant. (ii) Identify an independent variable.
- Materiał graficzny
Zadanie 2b
Outline how to prepare 100 g of a 12% by-mass protein mixture.
- Materiał graficzny
Zadanie 2c
Explain why each treatment is replicated.
- Materiał graficzny
Zadanie 2d
Deduce whether ultrasound pretreatment improves hydrolysis in this experiment.
- Materiał graficzny
Zadanie 3a
State two environmental variables that suitable probes could record.
- Materiał graficzny
Zadanie 3b
Suggest one advantage of using a mesocosm for this investigation.
- Materiał graficzny
Zadanie 3c
Outline requirements for a sealed mesocosm to sustain its community.
- Materiał graficzny
Zadanie 4a
Comment on the claim that some complex skills are learned more readily early in life, using the data.
- Materiał graficzny
Zadanie 4b
State one method other than post-mortem examination for investigating the function of brain regions.
- Materiał graficzny
Zadanie 5a
On the diagram, label one chemoreceptor cell.
- Materiał graficzny
Zadanie 5b
Describe how these cells can detect different odorants.
- Materiał graficzny
Zadanie 5c
State two receptor types other than chemoreceptors.
- Materiał graficzny
Zadanie 6a
Describe how young birds would acquire their song under natural conditions.
- Materiał graficzny
Zadanie 6b
The following year, offspring of exposed adults hear no playback, yet their songs closely resemble the third panel. Suggest what this indicates about learning.
- Materiał graficzny
Zadanie 8a
(i) Identify the relationship between migration distance and plumage darkness. (ii) Suggest two explanations for variation in plumage other than mate choice.
- Materiał graficzny
Zadanie 8b
Explain how natural selection can change behaviour in a population.
- Materiał graficzny
Zadanie 9
Neurons communicate with other neurons at chemical synapses. Explain the roles of neurotransmitters in this communication.
Zadanie 10a
A microbial digester is supplied with a semi-liquid suspension of food-processing waste. Outline why this suspension is added.
Zadanie 10b
A culture of microorganisms is grown in a fermentation vessel. Explain how conditions in the vessel can limit growth.
Zadanie 11a
Deduce whether the gel supports successful transformation, giving a reason.
- Materiał graficzny
Zadanie 11b
Predict a suitable source of DNA for the negative control, giving a reason.
- Materiał graficzny
Zadanie 12a
Discuss whether the simulation supports the claim that detaching the matrix will help remove the biofilm.
- Materiał graficzny
Zadanie 12b
State the predicted effect on bacterial concentration in the remaining biofilm.
- Materiał graficzny
Zadanie 13
A genetic investigation must identify a change affecting exactly one nucleotide in a gene. Identify the most precise suitable method.
Zadanie 14a
State how many aligned positions contain the same amino acid in both proteins.
Zadanie 14b
Describe how an amino-acid sequence alignment can be obtained and used to compare proteins.
Zadanie 16
In a model orchard study, fruit-feeding beetles damage cultivated apricot fruit. Distinguish the trophic levels of the beetles and the apricot trees.
Zadanie 17a
Outline what is meant by primary succession.
- Materiał graficzny
Zadanie 17b
Describe two factors that could limit this ecosystem.
- Materiał graficzny
Zadanie 17c
Outline processes that can increase soil depth over time.
- Materiał graficzny
Zadanie 18a
(i) State the relationship between DDE concentration and shell thickness. (ii) Suggest one reason why a colony with thinner shells could decline.
- Materiał graficzny
Zadanie 18b
Deduce which colony would be expected to decline most, giving reasons.
- Materiał graficzny
Zadanie 18c
Outline how DDE can become biomagnified in these seabirds.
- Materiał graficzny
Zadanie 19
A closed culture of floating aquatic plants is monitored over 29 days. Suggest reasons why population growth slows after day 9.
- Materiał graficzny
Zadanie 20a
Runoff transports dissolved nitrogen fertilizers from cropland into a nearby lake. Outline possible effects on the lake ecosystem.
Zadanie 20b
State the overall relationship between elevation and leaf nitrogen concentration.
- Materiał graficzny
Zadanie 20c
Suggest two factors other than elevation that could explain differences in leaf nitrogen.
- Materiał graficzny
Zadanie 22
A diet provides very little fat over an extended period. Suggest one possible resulting problem.
Zadanie 24
The chart is a constructed comparison of six factors associated with cardiovascular disease. Describe how two named factors in the chart can contribute to coronary heart disease.
- Materiał graficzny
Zadanie 26
Red blood cells participate in transport between respiring tissues and lungs. Outline how these cells carry respiratory gases.
Zadanie 27
Nutrients move from the intestinal lumen into the circulation and then reach the liver. Explain adaptations of villus epithelial cells for absorption and what can happen to absorbed nutrients in the liver.