Praxis II Pennsylvania Grades 4-8 Subject Concentration: Science (5159) Test Questions

1. Which of the following compounds is not allowed in a school laboratory because it is a potential carcinogen?
a. Lead
b. Benzene
c. Aspartame
d. Methanol

2. A laboratory experiment requires that red blood cells be separated from the serum in whole blood. Which of the following laboratory techniques would be most appropriate for this task?
a. Spectroscopy
b. Sublimation
c. Microscopy
d. Centrifugation

3. Which of the following quantities is largest in the metric system of measurement?
a. 10 decigrams
b. 100 milligrams
c. 100 grams
d. 1 decagram

4. In an experiment on respiration, carbon dioxide production is measured over time. Placing the data in a chart is
a. A visual representation of the data
b. A conclusion based on the data
c. The raw data
d. A comparative analysis of the data

5. In order to be included in the formation of a scientific conclusion, evidence must be
a. Quantitative
b. Reproducible
c. Obvious
d. All of the above

6. A researcher is studying the response of bacteria to a certain chemical. In three experiments, the bacteria swim towards the chemical, and in one experiment the bacteria swim away from it. What would be the most appropriate next step for the researcher?
a. Report only the first three experiments.
b. Report all the experiments, but refrain from making any conclusions.
c. Repeat the experiment several more times and apply a statistical analysis to the data.
d. Repeat the experiment, adding a new chemical to determine its effect on the bacteria.

7. Which of the following biological discoveries was made first?

a. Louis Pasteur discovered the causative role of microorganisms in disease.
b. Charles Darwin discovered the principles of natural selection.
c. Gregor Mendel discovered that genes are the basic units of inheritance.
d. Carl Von Linnaeus discovered that living things could be organized into a binomial system of nomenclature.

8. In a study investigating the causes of stomach ulcers, researchers observed that coffee drinkers had a higher incidence of stomach ulcers than those who didn’t drink coffee. This is an example of

a. A controlled experiment
b. A cause and effect relationship
c. Correlation between two variables
d. Systematic error in sampling

9. Which of the following is an example of a renewable resource?

a. Trees
b. Ore minerals
c. Fossil fuels
d. Cash crops

10. Which of the following is NOT a significant factor in the dramatic increase of the human population over the past few hundred years?

a. Increased availability of habitable land
b. Scientific advances in agriculture
c. Improved sanitation
d. An understanding of the causes of communicable diseases

Praxis II Pennsylvania Grades 4-8 Subject Concentration: Science (5159) Test Answer Key