Zadanie 1a
Define transpiration.
Biology HL Paper 2, May 2022, 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 15 zadań z tego arkusza, razem 64 punkty, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Testing species association with chi-squared (4), Evaluating biological evidence and methods (2), DNA packaging around histones (2).
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Dodaj cały arkusz do zestawuZadanie 1b
Suggest one advantage that microbial root inoculation could have over repeated selective breeding for drought resistance.
Zadanie 2a
Cell division requires coordinated timing. State the role of cyclins in the cell cycle.
Zadanie 2b
Chromosomes package genetic information. Distinguish the typical chromosome structure of a bacterium from that of a eukaryotic nucleus.
Zadanie 3a
State an alternative hypothesis for the test.
Zadanie 3b
Calculate the expected number of quadrats containing both species if occurrence is independent. Show your working.
Zadanie 3c
State the number of degrees of freedom.
Zadanie 3d
The calculated chi-squared value is 0.111; the critical value is 3.84. Explain the conclusion.
Zadanie 4a
State the organ that produces melatonin.
Zadanie 4b
A traveller crosses several time zones. Deduce, with a reason, the local time of day at which restoring a rise in melatonin would support the usual sleep–wake cycle.
Zadanie 5a
(i) Describe the structure of a nucleosome. (ii) Explain what holds the two DNA strands together. (iii) Outline how tandem-repeat regions are used in DNA profiling.
Zadanie 5b
(i) Explain the physiological changes in type 1 diabetes. (ii) State a measure used in managing this condition.
Zadanie 6
Plant transport and cellular energy transformations support growth. (a) Describe how a plant moves organic compounds from their source to a storage sink. (b) Compare and contrast photosynthesis with aerobic cellular respiration.
Zadanie 7
Enzymes, replication and evolutionary processes affect biological systems. (a) Outline, using graphs, effects of factors that influence enzyme activity. (b) Describe the functions of three named enzymes in DNA replication. (c) Explain speciation, including…
Zadanie 8
Membrane transport and kidney function contribute to water and solute balance. (a) Outline four different ways substances cross the plasma membrane, giving an example for each. (b) Explain how kidney regions contribute to water balance and excretion of…