Zadanie 1a
State the purpose of the limewater in vessel B.
- Materiał graficzny
Biology SL 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 28 zadań z tego arkusza, razem 50 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Evaluating biological evidence and methods (8), Recording and interpreting biological data (8), Planning a biological investigation (4).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Suggest why the soil and pot are enclosed in a sealed plastic covering.
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Zadanie 1c
Suggest a suitable control setup.
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Zadanie 1d
The plant chamber is now exposed to bright light. Predict with a reason the appearance of the limewater in C after one hour under conditions permitting active photosynthesis.
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Zadanie 2
A researcher maintains living animal cells in an aqueous medium during microscopy. Explain why the medium should have the same osmolarity as the cells.
Zadanie 3a
(i) State one suitable source of a person’s DNA. (ii) State how a small DNA sample can be amplified.
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Zadanie 3b
Deduce which candidate is the father, giving a reason.
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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 5a
The model data compare total photoreceptor density in two mammals at several retinal positions. Suggest whether these data establish that mammal A has better colour vision than mammal B.
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Zadanie 5b
Distinguish chemoreceptors from mechanoreceptors and give one example of each.
Zadanie 6
The diagram labels a region of the brain X. Explain how X helps regulate breathing rate.
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Zadanie 8a
A sealed microbial digester converts organic waste into biogas. State one suitable source of organic material for this process.
Zadanie 8b
A microbial biogas digester leaves a solid and liquid organic residue. State one useful application of this residue.
Zadanie 9a
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 10
A model cleaning trial compares a microbial cleaning product, bacteriophages and their combination against a water control on contaminated surfaces. Deduce which treatment is most effective, giving a reason.
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Zadanie 11
A fermentation vessel is used to grow microorganisms that manufacture a useful product. Explain why conditions in the vessel must be controlled carefully.
Zadanie 12a
State the effect of raising fish density on FCR.
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Zadanie 12b
Evaluate recirculating tanks rather than flow-through tanks for fish grown at high density.
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Zadanie 13a
Describe the overall pattern in the species counts.
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Zadanie 13b
Describe a method for measuring herbaceous-plant diversity at different distances from a road within a green space.
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Zadanie 14a
(i) Identify the trophic level occupied by the lizard. (ii) Identify the type of interspecific relationship between the owl and the lizard.
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Zadanie 14b
Describe advantages of ex situ conservation for a rapidly declining population of owls.
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Zadanie 14c
Outline one limitation of an energy pyramid representing this food web.
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Zadanie 15
Plastic debris reaches a coastal ecosystem from several human activities. Explain consequences of plastic pollution for marine life.
Zadanie 16a
Identify the overall effect of the higher-protein diet on appetite.
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Zadanie 16b
Explain why a protein-rich diet may be unsuitable for an adult with phenylketonuria (PKU).
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Zadanie 17
A constructed phototherapy dataset records the percentage decrease in serum bilirubin after a fixed period of visible blue-light exposure. Deduce the relationship between light intensity and the bilirubin remaining after exposure.
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Zadanie 18
An intestinal absorptive epithelial cell contains many mitochondria. Outline why this supports the cell’s function.