Zadanie 1a
A student observes a field of stained dividing root-tip cells. Describe how to determine a mitotic index for this field.
Biology HL Paper 3, May 2024, 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 31 zadań z tego arkusza, razem 71 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (12), Evaluating biological evidence and methods (9), Bacterial coordination by quorum sensing (2).
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Dodaj cały arkusz do zestawuZadanie 1b
A constructed experiment exposes young barley roots to cadmium ions. The chart shows mean mitotic indices with SD. (i) State the relationship between cadmium concentration and mitotic index. (ii) Suggest a consequence for the plant.
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Zadanie 2a
Define osmolarity.
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Zadanie 2b
Comment on how osmolarity affects light output.
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Zadanie 2c
Plant-tissue pieces are weighed before and after immersion in a range of solutions. Outline how these measurements can estimate tissue osmolarity.
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Zadanie 3
Eighteen volunteers squeeze a force sensor as strongly as possible for seven minutes. The continuous curve is a model of their mean response. (i) State one participant variable that could influence the results. (ii) Suggest a reason for the curve’s shape.
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Zadanie 4
A constructed survey compares social grooming in five bat species kept in separate groups under matched conditions. Social grooming is cleaning another individual’s coat. Compare and contrast grooming among the five species.
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Zadanie 8
Chemical messengers mediate communication at synapses. Discuss how drugs can alter messenger release and reception at synapses.
Zadanie 9a
Four small model digesters contain equal volumes of water and organic waste. Manure is used alone or mixed with fruit waste, vegetable waste or grass. Temperature and pH are held constant. State one benefit of using biogas.
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Zadanie 9b
Four small model digesters contain equal volumes of water and organic waste. Manure is used alone or mixed with fruit waste, vegetable waste or grass. Temperature and pH are held constant. Compare and contrast gas production for the four mixtures.
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Zadanie 10a
A model tests bacterial survival after exposure to bacteriophages. Cells are tested as an intact surface community, a mechanically dispersed community or free cells. Error bars represent modelled ranges among replicate cultures. Identify the state most…
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Zadanie 10b
Bacteria are challenged with phages in intact or dispersed surface communities and as free cells. Error bars represent modelled ranges among replicate cultures. Suggest how properties of the surface communities could explain the survival pattern.
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Zadanie 12
A hypothetical assay uses reverse-transcription PCR to distinguish HIV variants at two variable regions, R and S. Five primer pairs give the fragment sizes below. The all-variant product confirms viral material; a variant has one R and one S category. Lane1 is…
- Tabela do uzupełnienia
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Zadanie 13
A genome browser provides access to human chromosomes and corresponding sequence information from other organisms. Discuss how such a database can be used to study human chromosome18.
Zadanie 14
A crop is modified to survive treatment with a particular herbicide. Discuss potential benefits and risks of growing this herbicide-resistant crop.
Zadanie 15a
(i) Identify the most important predictor. (ii) Suggest one reason for its importance.
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Zadanie 15b
Distinguish between a species’ fundamental and realized niches.
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Zadanie 15c
Suggest a reason for a decline in the bird population using the information given.
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Zadanie 16a
The harlequin ladybird, Harmonia axyridis, is not native to Europe. Outline its introduction into Europe.
Zadanie 16b
A hypothetical introduced amphibian normally breeds near neutral pH. In its introduced range, breeding pools span pH4.3–9.8. A model laboratory study measures hatching and subsequent larval length at five pH values. The hatching bars include uncertainty…
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Zadanie 17
Some pesticides persist after application. Outline environmental effects of DDT.
Zadanie 18a
Outline how a transect and quadrats can be used in ecological fieldwork.
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Zadanie 18b
Identify the group with the highest ground cover.
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Zadanie 18c
Outline the type of succession represented.
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Zadanie 19
Phosphate fertilizer is applied to farmland. Discuss benefits and risks of this practice.
Zadanie 20a
A hypothetical outbreak of a waterborne intestinal infection produces the hospital-admission pattern shown. Suggest one reason for this age distribution.
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Zadanie 20b
The large intestine is part of the digestive tract. Outline processes occurring there in a healthy person.
Zadanie 21
Two main sounds occur during a cardiac cycle. Outline their causes.
Zadanie 22a
Phenylketonuria occurs in humans. Outline its cause.
Zadanie 22b
A model study tests a hypothetical compound Z in children with mild phenylketonuria. A dose is given one hour after a protein-rich meal. Blood phenylalanine is measured before the meal, before the dose and three times afterwards. Evaluate the hypothesis that…
- Materiał graficzny
Zadanie 23
Different chemical classes of hormones interact with target cells in different ways. Distinguish between steroid and peptide hormones.