Zadanie 1a
State the dependent variable.
- Materiał graficzny
Biology HL Paper 3, November 2024
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 41 zadań z tego arkusza, razem 77 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (15), Evaluating biological evidence and methods (9), Conditions affecting enzyme reaction rates (3).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Deduce which support to use, giving a reason from the results.
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Zadanie 1c
Explain why temperature should remain at48 degrees C throughout the measurements.
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Zadanie 1d
Suggest a measured variable from which enzyme activity could be determined.
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Zadanie 2a
Describe how to prepare the0.080mol per litre solution from the0.160mol per litre stock.
Zadanie 2b
Explain the response to distilled water.
Zadanie 2c
Deduce which tested concentration is most likely to be close to the isotonic concentration, giving a reason.
Zadanie 3a
Identify the pigment most soluble in the solvent used.
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Zadanie 3b
Describe how such a chromatogram can be obtained.
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Zadanie 3c
State how the Rf value is calculated.
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Zadanie 4a
Specialized nerve cells develop during formation of the nervous system. Describe the formation of neurons.
Zadanie 4b
The medulla oblongata contributes to coordination of body functions. Outline two functions of the medulla oblongata.
Zadanie 5
A conceptual model compares the light absorption of four photoreceptor types. Identify the receptor most sensitive to light at620nm.
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Zadanie 6
A hypothetical crossover experiment uses pupil-diameter change as a measure of response to rewards. Participants complete sessions with and without a dopamine-related treatment; session order is counterbalanced. Values are changes relative to no reward,…
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Zadanie 7a
A hypothetical animal study pairs a tone with a gentle air puff that triggers blinking. Young and older animals experience a delay of500ms or800ms. Learning is measured as the percentage responding to the tone alone. Define learning by reflex conditioning.
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Zadanie 7b
A hypothetical animal study pairs a tone with a gentle air puff that triggers blinking. Young and older animals experience a delay of500ms or800ms. Learning is measured as the percentage responding to the tone alone. Compare and contrast learning in the two…
- Materiał graficzny
Zadanie 7c
The conceptual reflex diagram shows two pathways marked A and B. Identify which pathway contains(i) the motor neuron and(ii) the sensory neuron.
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Zadanie 9a
(i) Suggest how growth rate could be measured. (ii) Explain the increase in growth between11 and31 degrees C.
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Zadanie 9b
(i) Evaluate raising the operating temperature from36 to38 degrees C. (ii) State another factor that may limit this batch culture.
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Zadanie 11a
Define a biofilm.
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Zadanie 11b
Suggest two factors that could affect antibiotic action on this community.
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Zadanie 12
A hypothetical gene has three alleles, R, S and T. An intronic region has1080 base pairs. The table lists19 variable positions; all other bases are identical. Calculate the percentage of different bases between alleles R and S across this intronic region,…
- Tabela do uzupełnienia
Zadanie 14a
State which species has the greatest increase in density between14 and18km.
Zadanie 14b
Describe possible consequences of untreated-sewage pollution in the river.
Zadanie 14c
Deduce which species could indicate relatively unpolluted water, giving a reason.
Zadanie 15a
A hypothetical intestinal parasite grows first in a crustacean, then in a small fish that eats it, and finally reproduces in a fish-eating bird. Discuss the trophic level of the parasite.
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Zadanie 15b
Two conceptual models compare nutrient stores and flows in biomes. Deduce which nutrient store is represented by X, giving a reason.
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Zadanie 16a
Define species richness.
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Zadanie 16b
Evaluate whether increasing pollinator richness could improve crop yield.
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Zadanie 17a
A model stream-channel experiment manipulates the presence of grazing snails and addition of nitrate plus phosphate. After eight weeks, investigators estimate the changes in cell volume of three photosynthetic groups. Other consumers are excluded. (i) Identify…
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Zadanie 17b
Phosphate becomes available to organisms through several processes. State two sources of phosphate in an ecosystem.
Zadanie 17c
Nitrogen fixation contributes to nutrient supply in ecosystems. Outline nitrogen fixation.
Zadanie 19
A hypothetical mammal can synthesize metabolite U. Four experiments test candidate precursors P-S. The graphs show urinary output of U. An upward arrow marks the start of precursor injections and a downward arrow marks their withdrawal. Determine which…
- Materiał graficzny
Zadanie 20
Hemoglobin is synthesized in developing red blood cells. Outline its role in respiratory-gas transport.
Zadanie 21a
Blood pH is monitored during regulation of ventilation. State the receptor type involved.
Zadanie 21b
A person changes from rest to vigorous exercise. State the expected relationship between exercise intensity and blood pH.
Zadanie 21c
Working muscles require increased oxygen delivery. Explain how the Bohr shift helps meet this demand during exercise.
Zadanie 22a
Electrical conduction through the atrioventricular node includes a brief delay. Outline why this delay is useful.
Zadanie 22b
Identify the two categories with the highest estimated risk.
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Zadanie 22c
The investigators suggest that a higher body-mass index sometimes reflects muscle rather than fat. Discuss this suggestion using the results.
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Zadanie 22d
State another disease for which excess body fat is a risk factor.
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