Mini-Assessment
1. During a laboratory activity, a student combined two solutions. In the laboratory report, the student wrote “A yellow color appeared.” What does this statement represent?
A. a conclusion
B. a hypothesis
C. an observation
D. a theory
2. The table below shows the speed at which certain galaxies are moving. You want to determine how much faster one galaxy is moving than another. To which step in a scientific investigation does this operation apply?
A. analyzing the data
B. communicating the results
C. drawing a conclusion
D. proposing a hypothesis
3. You are the head of the research division of a company that grows vegetables using hydroponic technology. Hydroponic technology involves growing plants in containers of growth solution in a greenhouse. No soil is used. The growth solution that the company uses contains water, nitrogen, and phosphorous. The company wants to know whether adding iron to this formula will improve the growth of the lettuce. What is the hypothesis to be tested in this experiment?
A. If soil is used, the lettuce will grow at a faster rate.
B. If the plants are moved outdoors, the lettuce will grow at a faster rate.
C. If iron is added to the hydroponic solution, the lettuce will grow at a faster rate.
D. If nitrogen is removed from the growth solution, the lettuce will grow at a faster rate.
4. Which of the following is not a testable hypothesis?
A. All females are taller than males at age 12.
B. Height is affected by childhood nutrition.
C. All men who are married are taller than their wives.
D. Being taller is always better than being shorter.
5. How do scientists usually communicate and defend the results of an investigation?
A. by calling a press conference
B. by writing and publicizing a book
C. by publishing the results in a scientific journal
D. by keeping a journal in the laboratory