Zadanie 1f
Outline an appropriate control treatment for the reef mesocosm experiment.
- Materiał graficzny
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 50 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 50 Otwórz w wyszukiwarce z filtrami
Zadanie 2c
(i) Suggest why a water-filled beaker is placed between the lamp and the plant tube. (ii) Identify two variables that should be kept constant.
- Materiał graficzny
Zadanie 2a
Outline why the tissue discs should be equal in size.
Zadanie 2c
Outline one reason for the independent repeats at each temperature.
Zadanie 3a
Two upright oat coleoptiles receive light from the left. A thin impermeable insert is placed just below the tip on opposite sides of P and Q. The diagram records their appearance before and after exposure. (i) Identify the directional response of Q. (ii)…
- Materiał graficzny
Zadanie 3d
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.
- Materiał graficzny
Zadanie 1
Researchers introduce plasmids into cultured mammalian follicle cells. One plasmid contains a candidate regulatory gene R. A second uses the same vector backbone but lacks R. All other treatment steps are identical. Identify the control treatment.
Zadanie 3a
(i) Identify one independent variable in this investigation. (ii) State one other variable that should be controlled.
- Materiał graficzny
Zadanie 3a
(i) Identify both independent variables. (ii) Outline how assay temperature could be held constant. (iii) Explain why the concentration of ATP synthase must be the same in all assays.
- Materiał graficzny
Zadanie 4c
Discuss two variables that should be controlled in this investigation.
- Materiał graficzny
Zadanie 2a
(i) State the dependent variable. (ii) Identify what the isolated circles represent.
- Materiał graficzny
Zadanie 3c
Describe how to collect measurements for an action spectrum of an alga.
- Materiał graficzny
Zadanie 4b
List two variables to hold constant.
- Materiał graficzny
Zadanie 1a
(i) State the independent variable. (ii) Outline why using pieces of similar size and shape makes the results more reliable.
- Materiał graficzny
Zadanie 1c
Outline why paper positions should change between trials.
- Materiał graficzny
Zadanie 1a
Identify the independent variable.
Zadanie 1b
Identify two variables kept constant.
Zadanie 1c
Explain two changes that would improve this investigation.
Zadanie 2a
(i) Suggest a research question that could be investigated with this equipment. (ii) Identify two variables to control.
Zadanie 2b
Discuss precautions needed for a safe and ethical investigation.
Zadanie 3
Eighteen volunteers squeeze a force sensor as strongly as possible for seven minutes. The continuous curve is a model of their mean response. (i) State one participant variable that could influence the results. (ii) Suggest a reason for the curve’s shape.
- Materiał graficzny
Zadanie 10a
Identify one variable to control during cultivation.
- Materiał graficzny
Zadanie 18a
Outline how a transect and quadrats can be used in ecological fieldwork.
- Materiał graficzny
Zadanie 1h
Outline why the non-immersed control was included.
- Materiał graficzny
Zadanie 9a
(i) Suggest how growth rate could be measured. (ii) Explain the increase in growth between11 and31 degrees C.
- Materiał graficzny
Zadanie 1b
Identify one variable to hold constant when comparing activity across temperatures.
- Materiał graficzny
Zadanie 1d
Describe how to extend the investigation to locate the optimum temperature of immobilized catalase more precisely.
- Materiał graficzny
Zadanie 2a
Outline the purpose of initially boiling the broth.
- Materiał graficzny
Zadanie 2b
Describe how a control is provided.
- Materiał graficzny
Zadanie 2a
(i) State one variable to keep constant. (ii) Identify an independent variable.
- Materiał graficzny
Zadanie 2c
Explain why each treatment is replicated.
- Materiał graficzny
Zadanie 3a
Suggest why the reservoir needs a vented lid.
- Materiał graficzny
Zadanie 3c
Describe a treatment that could help identify which shoot parts lose water.
- Materiał graficzny
Zadanie 3a
State two environmental variables that suitable probes could record.
- Materiał graficzny
Zadanie 3b
Suggest one advantage of using a mesocosm for this investigation.
- Materiał graficzny
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 4b
State one method other than post-mortem examination for investigating the function of brain regions.
- Materiał graficzny
Zadanie 9
A vessel is used to grow microorganisms that produce a useful substance. State one physical or chemical condition to keep at an appropriate constant value to support production.
Zadanie 11b
Predict a suitable source of DNA for the negative control, giving a reason.
- Materiał graficzny
Zadanie 1a
Informacja do zadań 1 a-1 h. All values are constructed for a model investigation of mammalian metabolism. At steady state, a circulating metabolite enters the blood at the same rate as it is removed, so its concentration can remain stable despite continuous…
- Materiał graficzny
Zadanie 1a
Informacja do zadań 1 a-1 h. All values are constructed for a model investigation of mammalian metabolism. At steady state, a circulating metabolite enters the blood at the same rate as it is removed, so its concentration can remain stable despite continuous…
- Materiał graficzny
Zadanie 2b
State one environmental variable that should be held constant.
- Materiał graficzny
Zadanie 2b
State one environmental variable that should be held constant.
- Materiał graficzny
Zadanie 10b
State one reason for incubating the plates before recording the results.
- Materiał graficzny
Zadanie 10d
Distinguish between this method and an antibiotic-disc inhibition-zone test, referring to antibiotic placement and measurement of its effect.
- Materiał graficzny
Zadanie 10b
State one reason for incubating the plates before recording the results.
- Materiał graficzny
Zadanie 10d
Distinguish between this method and an antibiotic-disc inhibition-zone test, referring to antibiotic placement and measurement of its effect.
- Materiał graficzny
Zadanie 1f
Suggest one reason for expressing age as a proportion of typical lifespan rather than in years.
- Materiał graficzny
Zadanie 32
A water-filled potometer estimates water uptake by tracking a bubble in a capillary. To compare uptake rates of two leafy plant species, which variables should be kept the same? I. Total exposed leaf area. II. Air temperature. III. The decorative colour of the…