Practice Quiz

IB Biology Exam Prep - Question List

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51. The greatest component of blood by volume is:

  1. Plasma
  2. Red blood cells
  3. Lymphocytes
  4. Platelets
  5. Neutrophils
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52.
Formulating a testable hypothesis is particularly important when:
  1. Determining cause and effect relationships between observable phenomena.
  2. Interpreting a model that can be used to describe the workings of a natural system.
  3. Explaining the interactions of all natural phenomena in terms of a few basic laws.
  4. Describing as many characteristics as possible of living and nonliving things.
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53.
Which of the following best describes the importance of having a control group in an experiment?
  1. Insuring reproducibility of the results.
  2. Facilitating the peer review process.
  3. Reducing potential bias by the observer.
  4. Isolating the effect of a single variable.
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54.
A scientist planning to survey the characteristics of individuals in a particular plant population is careful to choose methods that guarantee random selection of the individuals to be measured. This randomization will:
  1. Reduce potential bias in the results.
  2. Increase the statistical significance of the results.
  3. Ensure reproducibility of the results.
  4. Provide a sufficient number of samples in the results.
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55.
A student is doing an experiment to determine how change in acidity affects enzyme activity. The time it takes for a disk soaked with catalase at different acidities to rise to the top of a vial containing 1% hydrogen peroxide will be measured. If the student presents the findings in a line graph, which of the following conditions will be represented on the x-axis of the graph?
  1. pH values
  2. Catalase concentrations.
  3. Disk rise times.
  4. Percent hydrogen peroxide.
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