Zadanie 2b
Identify the control treatment.
Planning a biological investigation
Develop a testable question and prediction, choose variables, controls and representative samples, justify the measurement range and repeats, and design a valid biological investigation.
Tę umiejętność sprawdza 41 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 41 Otwórz w wyszukiwarce z filtrami
Zadanie 2d
Describe ways to improve this investigation.
Zadanie 3b
A control contains the same mass of inert plastic beads instead of germinating seeds. Outline its purpose.
- Materiał graficzny
Zadanie 4b
State the dependent variable in this investigation.
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Zadanie 1c
In another trial, both groups receive an established effective treatment and only one group receives an additional experimental treatment. Suggest a reason for giving the established treatment to the control group.
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Zadanie 3e
Discuss two variables that should be controlled in this investigation.
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Zadanie 4a
Identify the independent variable represented by the three treatment groups.
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Zadanie 4b
State one other variable to keep constant.
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Zadanie 1b
Explain how quantitative measurements from all participants could assess improvement.
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Zadanie 1f
Suggest why unaffected tissue was included.
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Zadanie 2c
Explain an experimental approach to determine numbers of each species.
Zadanie 3a
State one independent variable.
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Zadanie 3a
Outline why temperature is the independent variable.
Zadanie 3d
Suggest how the reliability of the investigation could be improved.
Zadanie 1b
Describe two factors to keep constant for an accurate estimate.
Zadanie 3c
State one advantage of research using mesocosms.
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Zadanie 7b
A continuous fungal culture produces an organic acid in a fermenter. Outline one condition needed for effective production.
Zadanie 8
A fermenter maintains a microbial culture for continuous production. Identify two conditions that should be monitored to maintain suitable growth conditions.
Zadanie 18b
The team also plans comparisons between population groups with different cultural and social backgrounds. Explain why these comparisons could help the investigation.
Zadanie 1a
Suggest an appropriate control for the enzyme assay.
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Zadanie 1b
Suggest a reason for the twelve-minute wait.
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Zadanie 1e
Explain one improvement to the method.
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Zadanie 2b
Explain why replicate plates are needed.
Zadanie 3b
State one condition to keep constant across samples.
Zadanie 14b
Describe a method for recording algal abundance along the river.
Zadanie 1b
Suggest why the soil and pot are enclosed in a sealed plastic covering.
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Zadanie 1c
Suggest a suitable control setup.
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Zadanie 2b
Identify an independent variable and the dependent variable.
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Zadanie 3a
State one variable to standardize when setting up the tanks.
Zadanie 3b
Suggest one reason for covering tanks with mesh.
Zadanie 3c
Outline an advantage of seven replicates per treatment.
Zadanie 3d
Explain advantages of these mesocosms compared with manipulating a natural pond.
Zadanie 4
A neuroscience team compares ways to investigate the roles of different brain regions. Suggest one advantage of an appropriately designed animal experiment over a comparable invasive experiment in humans.
Zadanie 6b
State one method other than post-mortem examination for investigating the function of brain regions.
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Zadanie 9
A model screening experiment compares bacterial growth on agar with and without a test substance. Outline how to carry out this experiment.
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Zadanie 11
A fermentation vessel is used to grow microorganisms that manufacture a useful product. Explain why conditions in the vessel must be controlled carefully.
Zadanie 2b
State one variable that should be controlled when testing the effect of light intensity.
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Zadanie 2b
State one variable to keep constant.
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Zadanie 8b
Outline how one harmful change caused by microbial activity could be prevented.
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Zadanie 10
A model culture tests four antibacterial preparations on a bacterial lawn. X is a control disc. The plate is incubated at25°C for36hours before the schematic result is recorded. (i) Analyse the effects of the four preparations. (ii) Outline one reason for…
- Materiał graficzny
Zadanie 12
An aquatic shoot is tested at several sodium hydrogencarbonate concentrations using the apparatus shown. The trial duration, illumination and temperature are kept constant. Which measurement is the dependent variable? A. The concentration assigned to each…
- Materiał graficzny