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Vocabulary
Steps
Experiments
Reliable or Not?
Safety/ Graphing
100
A testable explanation for an observation or question. An educated guess.
What is a hypothesis.
100
Step one of the scientific method
What is identify the problem or question
100
A single variable is tested during the first trail of this.
What is a controlled experiment.
100
Repeating the experiment several times.
Reliable!
100
Should be worn when heating a solution in a test tube.
What are Goggles
200
When a hypothesis is tested
What is an experiment
200
In a scientific investigation, after the question is defined, this is the most likely next step.
What is to formulate a hypothesis.
200
In a controlled experiment this is the variable that is measured and recorded into a data chart.
What is the dependent or responding variable.
200
A student observes that an organism is green. A conclusion that can be drawn from this observation is that the organism must be a plant.
Not reliable. Not enough information is given to determine wether the organism is a plant or animal.
200
The opening of the test tube is pointed toward the student and the student is not wearing goggles.
Not safe lab behavior.
300
Used to observe general trends in the data
What is a Graph
300
During an experiment data should be placed in one of these.
What is a data table or chart.
300
A fake treatment given to test subjects. Used to reduce biases in the experiment.
What is a Placebo.
300
A biologist reported success in breeding a tiger with a lion, producing healthy offspring. Other biologists will accept this report as fact only if other researchers can replicate the experiment.
Reliable.
300
An experimental design included references from prior experiments, materials and equipment, and a step by step procedure. What else should be included in this experiment before it should be conducted safely?
safety precautions to be used.
400
The variable you are controlling and testing in an experiment.
What is the Independent Variable or Manipulated variable.
400
Where your hypothesis is either rejected or accepted based on experimental analysis.
What is a Conclusion.
400
It does not receive the experimental treatment (independent variable)
What is the control group.
400
A science researcher is reviewing another scientists experiment and conclusion. The students wanted to investigate the effect of varying concentrations of tryptophan on a bacterial culture. Several cultures of the same bacteria were grown on media, each with a different amount of the tryptophan. The cultures were incubated at 37C. At the end of 24 hours the cultures were examined.
Not Reliable, For a control group students should have used a culture that contained no tryptophan.
400
A student created a graph showing the relationship between concentration of washing soda and water temperature. The graph depicted a straight line extending from the origin (0,0) to the top right corner of the graph paper. What is a valid conclusion that can be drawn from this graph?
As concentration (amount, g) of washing soda increases the temperature of the water will increase as well.
500
A scientific explanation that is strongly supported by a variety of experimental data.
What is a Theory
500
In the 18th century, Linnaeus classified organisms based on their structural similarities. Modern classification determines relationships most accurately based on genetics and other biochemical similarities. This change in classification method best illustrates what about the scientific method?
What is science explanations are tentative and subject to change and improvement.
500
A student wanted to determine the effect of specific amino acids on growth in humans. The students used genetically identical mice raised under identical conditions except that some were given additional amounts of amino acids. What is a limitation to the students investigation?
The students used mice to test human growth hormones and may have different effects in mice.
500
A mouthwash experiment tested mouthwash against bacteria commonly found in the mouth. Four paper discs all the same size were used with different special brands and a generic control brand. They were left to grow for 24 hours and then examined.
Reliable, There is an experimental and control group present.
500
A student grew ten tomato plants and compared the amount of time the plant had been growing in weeks to the height the plant grew. The line extended from the origin (0,0) up to the right of the graph paper. The line went up rapidly then leveled off for the second half of the graph. What is a valid conclusion that can be drawn from this data.
The plant grew fastest during the first three weeks, and then it grew slower.