to test the effectiveness of a new nutrient supplement, one group of identical mice is given the supplement, and the other group is not given anything. which is the most complete list of the parts of an experiment presented in this scenario?
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If your hypothesis is "Estrogens in sewage runoff turn fish into hermaphrodites," what is your null hypothesis?
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Estrogens in sewage runoff have no effect in turning fish into hermaphrodites.
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"Engaging in aerobic activity three times each week will reduce cholesterol levels" is a:
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testable hypothesis.
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Terms in this set (53)
If your hypothesis is "Estrogens in sewage runoff turn fish into hermaphrodites," what is your null hypothesis?
Estrogens in sewage runoff have no effect in turning fish into hermaphrodites.
"Engaging in aerobic activity three times each week will reduce cholesterol levels" is a:
testable hypothesis.
"Science is self-correcting." This means:
science actively seeks to disprove its own theories and hypotheses.
An experimental condition applied to research subjects is called a:
treatment.
Which statement is most correct?
You can accept or reject a hypothesis but never prove it to be true.
Which statement cannot be evaluated by the scientific method?
...
Which of the following is a good example of two phenomena that are correlated but show no causal relationship?
...
Which of the following is the best description of a control group in an experiment?
The control group is identical to each test group, except for one variable.
Dr. Foster is studying the effectiveness of a new memory-boosting diet supplement. He posts an ad for subjects at two local colleges. He assigns 55 students from college A to the treatment group (daily doses of the diet supplement) and 60 students from college B (no supplement) to the control group. After 6 months of the study, Dr. Foster gives all of the students in each group a memory test. The treatment group scores an average of 20 points higher than the control group (a significant difference). Based on these findings, Dr. Foster declares that the memory-boosting supplement helps increase a person's memory. What would improve the design of the Dr. Foster's study?
Randomly assign students to one of the two conditions (treatment or control).
Which statement regarding visual displays of data is false?
The legend describes the content of the display.
Which of the following is the best way to state the relationship between "data" and "results"?
"Data" are the facts you collect from your experiment, whereas "results" are your interpretation of what the data mean.
Biology is:
the study of living things.
You are given a pill in a scientific trial that looks identical to a pill containing an active ingredient, but your pill does not contain an active ingredient. The pill you were given is called a(n):
placebo.
You conduct a study to determine how the amount of time spent studying affects students' performance on exams, and you want display the data you have collected using a line graph. What is the dependent variable, and on which axis should it be represented in your graph?
The dependent variable is "performance on exams," and it should be represented on the y-axis.
A biologist was concerned about the environmental effects of an insecticide being used in his area to kill mosquitos carrying equine encephalitis. So he decided to study the environmental impact of this insecticide on blue jay reproduction. He selected two small habitats with similar vegetation and similar-sized blue jay populations (about 120 birds) with equal reproductive rates. One habitat, selected at random, was sprayed with insecticide, whereas the other habitat was used as a control. Blue jay reproduction rates were measured in both habitats before and after the treatment.
What was the most important flaw in this investigation?
lack of replication
Pseudoscience capitalizes on the belief shared by most people that:
scientific thinking is a powerful method for learning about the world.
If you toss a coin and it comes up heads 73 consecutive times, what is the probability that it will come up heads on the 74th toss?
...
When conducting a scientific experiment, a(n) _____________ is tested.
prediction
An experimental condition applied to research subjects is called a:
...
Science as a way of seeking principles of order differs from art, religion, and philosophy in that:
...
Inclusion of misleading claims or "scientific-sounding" language to try and manipulate consumers is an example of:
...
When conducting a scientific experiment, a(n) _____________ is tested.
...
If the results of an experiment turn out differently from what you expected, then:
you should explore the possible reasons for this in the "Conclusions" section of your experimental write-up.
Which term best describes the application of scientific knowledge to specific purposes?
...
Alon claimed that a tincture of a local herb was effective in lowering anxiety and was planning to invest in the product. As evidence of his claim, Alon, who had anxiety over his financial situation, said that he felt much better after the treatment, was much more relaxed, and no longer worried about his finances. Which combination of methodological flaws best characterizes Alon's investigation?
Chapter 2
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Biology
9th -
10th
9th - 10th Chapter 2-3 Review Quiz for State T...
Anne Wells 8 plays
33 Qs
Show Answers See Preview 1. Multiple-choice 30 seconds Q.
An independent research company conducts an experiment on the effects of a melatonin supplement on sleep patterns in people. The company recruits people from across the country who have trouble sleeping. The setup of the experiment is represented in the table. To make this a controlled experiment, how should Group 3 be treated?
answer choices
they should receive no pill
they should receive a placebo pill at 8 pm
they should receive a 120 mg pill at 8 pm
they should receive an 80 mg pill at 10 pm
2. Multiple-choice 30 seconds Q.
In biology class, pole bean seeds are placed in groups of 10 and wrapped in paper towels. The paper towels are dampened with solutions having a pH of 3.0, 4.0, 5.0, or 6.0. Another group is dampened with purified water. After three days, the class records the number of seeds that have germinated. What question is this experiment designed to test?
answer choices
how do bean seeds affect the pH of water?
does pH affect how well bean seeds germinate?
do bean seeds need water to germinate?
will bean seeds germinate in three days?
3. Multiple-choice 30 seconds Q.
In biology class, students study the effects of temperature on an enzyme called catalase. Catalase aids in the reaction that breaks down hydrogen peroxide, a harmful cellular by produce, into the less harmful products of water and oxygen. The class finds that the enzyme’s activity increases until it reaches a temperature of around 40 degrees C. At temperatures greater than 40 degrees C, the enzyme activity quickly decreases. Which graph best illustrates the students’ data?
answer choices A B C D 4. Multiple-choice 30 seconds Q.
A commercial fertilizer claims that when it is given to flowering plants, the plants produce more flowers. A student decides to test this claim. She purchases six potted begonias of equal size. Each plant receives an equal amount of water and an equal amount of sunlight each day. For three of the plants, she uses the commercial fertilizer as directed on the label. She then counts the number of flowers on each plant every week for six weeks. What is the dependent variable in this experiment?
answer choices
the number of plants in the control group
the amount of water
the number of flowers
the amount of fertilizer
5. Multiple-choice 30 seconds Q.
The high school 4-H club wants to determine if using fertilizer will increase vegetable crop production. The club chooses three types of fertilizer to test in their garden. They use fertilizer A on the tomato plants, fertilizer B on the bean plants, and fertilizer C on the cucumbers. The squash plants receive no fertilizer. Throughout the growing season, the club tallied the number of tomatoes, beans, cucumbers, and squash that were harvested. How could the club improve the validity of their experiment?
answer choices
they should test at least one additional fertilizer
they should obtain the mass of the vegetables instead of counting
they should test all three fertlizers on each type of vegetable individually
they should mix all three fertilizers to use on the squash plants.
6. Multiple-choice 30 seconds Q.
Sarah performs an experiment on isopods (pill bugs). She wants to know what type of conditions they prefer: wet, dry, light, or dark. She sets up the testing apparatus shown below, and then she places ten isopods in each compartment. For three days, she diagrams the positions of the isopods as shown below. Sarah can conclude that isopods prefer what kind of environment?
answer choices light and dry light and moist dark and dry dark and moist 7. Multiple-choice 30 seconds Q.
James and Ryan plan an experiment to investigate the effects of exercise on heart rate. They test 35 students at their high school by having each student exercise for 3 minutes. Which of the following would be the best control for the experiment?
answer choices
all of the students should be in the same grade
all of the students should perform the same exercise
all of the students should have eaten the same lunch
all of the students should be the same height
8. Multiple-choice 30 seconds Q.
For a science fair, a student wants to determine the effect of water temperature on the breathing rate of goldfish. Six goldfish are used in the experiment and are separated into two tanks. Tank A holds three of the goldfish and is kept at a constant temperature of 25 °C. Tank B contains the other three goldfish and the water temperature is gradually lowered. Breathing rates per minute (BRPM) are determined at five degree increments by counting the number of times each fish opens its mouth per minute. The same fish are used throughout the experiment, and the results are shown in the table. What is the purpose of Tank A in this experiment?
answer choices
it acts as a backup in case a fish in Tank B dies.
it acts as the control group
it determines the optimum temperature for goldfish metabolism
Guys, does anyone know the answer?