Zadanie 1a
Estimate the chlorophyll concentration in the control at 12 hours.
- Materiał graficzny
Biology HL Paper 2, May 2025, 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 30 zadań z tego arkusza, razem 96 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (6), Evaluating biological evidence and methods (3), The shared core of viral structure (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Distinguish between the changes in cyanobacterial abundance in the control and in the treatment with clams at 8.2 mg L⁻¹ dissolved oxygen.
- Materiał graficzny
Zadanie 1c
Suggest a reason for the control’s change in chlorophyll concentration.
- Materiał graficzny
Zadanie 1d
Compare and contrast filtration at the two oxygen concentrations over the course of the experiment.
- Materiał graficzny
Zadanie 1e
Estimate the percentage of live clams in 1982 that belonged to species B.
- Materiał graficzny
Zadanie 1f
State whether the empty-shell sample collected in 2022 more closely resembles the 1982 or 2022 live sample, giving one reason.
- Materiał graficzny
Zadanie 1g
Discuss whether the percentage-composition chart demonstrates an increase in the population of species C since 1982.
- Materiał graficzny
Zadanie 1h
Calculate the percentage decrease in the mean density of species B in 1982 between depths of 1–2 m and 2–3 m.
- Materiał graficzny
Zadanie 1i
Compare and contrast the changes in mean density of species B and species C between the two survey years.
- Materiał graficzny
Zadanie 1j
Using all three datasets, deduce with reasons whether water quality in the river may have changed between the survey years.
- Materiał graficzny
Zadanie 2a
State both products when two free amino acids undergo a condensation reaction forming one peptide bond.
Zadanie 2b
Describe how differences among amino acids contribute to the variety of protein shapes.
Zadanie 2c
A ribbon representation of part of titin is shown. (i) Describe the secondary structure represented by the arrows and how it is stabilised. (ii) Explain two contributions of titin to sarcomere function.
- Materiał graficzny
Zadanie 3a
(i) State the type of interspecific relationship normally represented by mycorrhizae. (ii) State one benefit that an orchid can obtain from this association.
Zadanie 3b
Explain how one named plant can use allelopathy to reduce competition.
Zadanie 4a
On the diagram, label the capsid.
- Materiał graficzny
Zadanie 4b
Describe one characteristic used to argue that viruses are not living organisms.
- Materiał graficzny
Zadanie 4c
Explain how a temperate bacteriophage can persist and multiply through a lysogenic cycle.
- Materiał graficzny
Zadanie 5a
State which labelled molecule is the ligand.
- Materiał graficzny
Zadanie 5b
Explain how binding of epinephrine can produce a response inside this cell.
- Materiał graficzny
Zadanie 5c
Describe two ways in which epinephrine helps the body support vigorous muscle activity.
- Materiał graficzny
Zadanie 6a
On the diagram, add P beside the step involving initial phosphorylation, and O beside the step involving oxidation of triose phosphate.
- Materiał graficzny
Zadanie 6b
State the cellular location of this pathway.
- Materiał graficzny
Zadanie 6c
Outline how animal cells regenerate oxidised NAD so glycolysis can continue when oxygen supply is insufficient.
- Materiał graficzny
Zadanie 7a
State the mode of speciation illustrated.
- Materiał graficzny
Zadanie 7b
Describe how the two species could have arisen from the ancestral population.
- Materiał graficzny
Zadanie 7c
Explain how clearing forest could reduce the population size of one of these primates.
- Materiał graficzny
Zadanie 8
Water influences the operation of organisms and the stability of their environments. (a) Outline how cohesion between water molecules benefits organisms. (b) Describe ecological consequences of ice loss and altered ocean circulation. (c) Explain how hormones…
Zadanie 9
A multicellular organism uses inherited DNA information during development and reproduction. (a) Describe causes of base substitutions and their possible consequences. (b) Distinguish between mitotic and meiotic cell division in eukaryotes. (c) Explain how…
Zadanie 10
The activity of a complex organism depends on coordination between structures at several levels. (a) Outline how organelles cooperate in the synthesis and export of a secreted protein. (b) Describe the coordinated muscle actions that cause inhalation. (c)…