Multiple Choice
In the context of experimental design, what is a 'control' in an experiment?
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1. Introduction to Biology
Experimental Design
Back1. Introduction to Biology
Experimental Design
- Multiple ChoiceWhich of the following is true of the simplest experimental design?25views
- Multiple ChoiceIn the context of experimental design, which of the following best describes a controlled variable?23views
- Multiple ChoiceIn an experimental investigation, what is the primary purpose of a control group?22views
- Multiple ChoiceIn an experiment testing the effect of a new fertilizer on plant growth, which of the following would be considered the control group?383views
- Open Question
Jonathan wants to know which style/model of paper airplane is going to win the contest by traveling the furthest. He designs 5 different models of paper airplanes and drops each of them from the same height of 20 meters. He records the distance that each plane travels before it hits the ground. What are the independent and dependent variables of Jonathan's experiment?
Independent Variable: ______________________________________
Dependent Variable: _______________________________________
1359views46rank2comments - Multiple Choice
In an experiment to test the effect of temperature bacterial reproduction rate, temperature would be the:
3611views34rank1comments - Multiple Choice
The temperature at which an alligator's egg is incubated will determine the sex of the offspring. The dependent and the independent variables in this experiment are ________.
4204views40rank - Multiple Choice
A scientist wants to study the effects of nitrogen on wheat plants. They set up an experiment with 4 groups of plants: group A gets 20 pounds of nitrogen per acre, group B gets 40 pounds per acre, group C gets 60 pounds per acre, and group D gets 0 pounds per acre. Which of the following is the control group? Is it a positive or negative control group?
3168views41rank - Multiple ChoiceShould an experiment test only one variable at a time? Why or why not?6539views2rank
- Multiple ChoiceRadon is a radioactive gas that seeps into homes from the soil. It is thought to be a cause of lung cancer. A research team investigates this hypothesis. The members of the team gather large amounts of data on basement radon concentrations and lung cancer rates and conclude that the more radon there is in a home, the more likely are people living in the home to develop lung cancer. After the study is published, other researchers criticize it by asserting that the studied neighborhoods with higher radon concentrations also have a higher percentage of older people and a higher percentage of cigarette smokers than the low-radon neighborhoods. Both advanced age and cigarette smoking increase the risk of lung cancer. This criticism, if correct, shows that the radon study suffered from __________.1604views
- Multiple ChoiceA company was testing a new drug it thought would help decrease the risk of transmission of viruses from mother to fetus. In an experiment to test the compound, an investigator gave 400 pregnant female rats a small dose of the experimental drug and inoculated each with a type of virus known to cause disease in rats. At the same time, 400 other pregnant rats were given only the virus. Of the rat pups born to the females that received both the virus and the drug, 197 showed no symptoms of the disease; 205 rat pups born to the virus-only females showed symptoms. From these data, we can best conclude __________.1398views
- Multiple ChoiceThe best method for determining whether bean plants require sodium is to __________.1226views
- Multiple ChoiceA team of scientists has devised a new chemical fertilizer that its members believe will increase crop yields. The team planted three garden plots with corn. The soil was similar in each, and equal amounts of water were applied to each plot. One plot was treated with a common commercial fertilizer, another was treated with the new fertilizer, and the third plot was not given any fertilizer. The experimenters measured yields as bushels of corn from each plot. The plot that did not receive fertilizer was the __________.959views
- Textbook QuestionAdd labels to the figure that follows, which illustrates the characteristics of research participants in control versus experimental groups.905views