Zadanie 1d
Calculate the percentage change in hydrogen carbonate concentration from the reference to the twice-reference projection.
- Materiał graficzny
Biological calculations, statistics and graphs
Apply units, scales, ratios, percentages and rates; interpret variation, uncertainty, error bars and correlations; choose and interpret statistical tests and biological indices; construct suitable graphs, keys, food webs and pedigrees.
Tę umiejętność sprawdzają 44 zadania wzorowane na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 44 Otwórz w wyszukiwarce z filtrami
Zadanie 1b
Outline the trends as interval P ends and interval Q begins.
- Materiał graficzny
Zadanie 1c
Identify the relationship between site temperature and shrub stomatal density.
- Materiał graficzny
Zadanie 1e
State the greatest upper-epidermis stomatal density among wild grasses grown at 430 ppm CO₂.
- Materiał graficzny
Zadanie 1a
Calculate the difference in mean survival between the highest fungus-P dose and the control.
- Materiał graficzny
Zadanie 1b
Distinguish the outcomes at 2 × 106 P spores mL⁻¹ from those in the control.
- Materiał graficzny
Zadanie 1d
Identify the fungus-Q concentration that reaches complete mortality first.
- Materiał graficzny
Zadanie 1f
Calculate the mean number still alive on day 4 in the group initially 20% infected.
- Materiał graficzny
Zadanie 2a
Calculate the mean rate of oxygen bubble production at 12 cm.
- Materiał graficzny
Zadanie 3a
Draw a straight line of best fit on the graph.
- Materiał graficzny
Zadanie 3b
The Pearson correlation coefficient for these data is r = 0.884. Comment on the significance of this value.
- Materiał graficzny
Zadanie 3c
In a two-hour run, the marker travels 40 mm through a capillary of internal radius 0.60 mm. Calculate the oxygen uptake rate in mm³ h⁻¹ to two decimal places. Use V = πr2l with π = 3.14.
- Materiał graficzny
Zadanie 4a
Identify the mean number of spots per fish under strong predation at month 21.
- 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 1a
(i) Calculate the seasonal water-temperature difference. (ii) Calculate summer CPUE as a percentage of winter CPUE.
- Materiał graficzny
Zadanie 2e
Describe the strength of association between the two methods.
- Materiał graficzny
Zadanie 3b
(i) Distinguish standard deviation from standard error. (ii) Suggest why the C-fibre SD is not reported for animal10.
Zadanie 3c
(i) Calculate the ratio of the overall C-fibre speed to the overall L-fibre speed. (ii) Suggest one reason for the faster C-fibre conduction.
Zadanie 4a
Calculate the percentage decrease from the maximum annual cleared area to the2016 value.
- Materiał graficzny
Zadanie 1b
Suggest why the mass changes are expressed as percentages.
- Materiał graficzny
Zadanie 1a
Calculate the difference in mean examination time between prey scent alone and the mixed scent.
- Materiał graficzny
Zadanie 1f
Estimate the distance at which displaying prey has a 50% chance of receiving a strike.
- Materiał graficzny
Zadanie 1d
Calculate the difference between the two mean volume changes in the later experiment.
- Materiał graficzny
Zadanie 1g
Calculate the percentage of surveyed plots receiving exactly two bird visits.
- Materiał graficzny
Zadanie 1e
(i) Calculate the percentage increase in prey density from 1985 to 1991. (ii) Evaluate whether the record supports dependence of species B survival on prey density, referring to particular intervals.
- Materiał graficzny
Zadanie 1f
Calculate the percentage change in the aromatic fraction from February 2012 to July 2018.
- Materiał graficzny
Zadanie 1c
Evaluate the reliability of the activity results.
- Materiał graficzny
Zadanie 1b
(i) Identify the percentage receiving vaccine A in year 33. (ii) Calculate the interval between vaccine D reaching 40% coverage and vaccine R reaching 40%.
- Materiał graficzny
Zadanie 2b
Outline how to prepare 100 g of a 12% by-mass protein mixture.
- Materiał graficzny
Zadanie 2c
Explain why each treatment is replicated.
- Materiał graficzny
Zadanie 3d
Explain how the two-balance apparatus distinguishes water uptake from water loss.
- Materiał graficzny
Zadanie 14b
Describe how an amino-acid sequence alignment can be obtained and used to compare proteins.
Zadanie 17c
Distinguish species richness from species evenness.
- Materiał graficzny
Zadanie 22a
Calculate the duration for which all four chambers are simultaneously in diastole.
- Materiał graficzny
Zadanie 2a
Explain why a standard-deviation error bar cannot be calculated from the single m2-with-salt observation.
- Materiał graficzny
Zadanie 2a
Explain why a standard-deviation error bar cannot be calculated from the single m2-with-salt observation.
- Materiał graficzny
Zadanie 18b
Compare the two growth curves.
- Materiał graficzny
Zadanie 18b
Compare the two growth curves.
- Materiał graficzny
Zadanie 1a
Estimate the difference between the highest and lowest mean body temperatures.
- Materiał graficzny
Zadanie 1e
The typical human lifespan used in this model is 85 years. Estimate the bone porosity of the human observation representing age 34 years.
- Materiał graficzny
Zadanie 1i
Calculate the percentage increase in mean peptide P from before to during hibernation.
- Materiał graficzny
Zadanie 2a
Calculate the increase from 1885 to 2015.
- Materiał graficzny
Zadanie 3b
Calculate the expected number of quadrats containing both species if occurrence is independent. Show your working.
Zadanie 1i
Calculate the percentage of containers containing food.
- Materiał graficzny