Biology with Earth and Space A Full Class

Which of the following is an example of a quantitative observation?

8 Geese flew in a V formation.

Which of the following is an accurate description of a testable question?

A question that can be answered using an experiment.

A theory is different from a hypothesis because:

A theory is accepted as true because of the accumulation of supporting evidence.

Laws are considered to be __________________.

Absolute

Ming is having trouble sleeping and decides to participate in a study to determine whether a certain medication helps people sleep. There are 30 volunteers, each of whom is assigned to 1 of 2 groups. Volunteers in group 1 are given the medication, and volunteers in group 2 are given a placebo (a pill with no medication). Which step is important in order to ensure scientifically valid results?

Assigning the subjects to groups at random

The main difference between basic science and applied science is__________________.

Basic science increases understanding and knowledge and applied science create solutions.

Which of the following should be included when making a general question testable?

Both the cause and the effect of the change that is being tested.

Which of the following would provide the most accurate results for an experiment?

Compare a large sample size from multiple trials.

The part of the experiment that is established to determine what happens under normal conditions.

Control

In an experiment, what do you call the variables that must be the same throughout the experiment?

Controlled variables

Which of the following is an example of a testable question?

Does increasing the temperature of water cause salt to dissolve at a faster rate?

A theory and a law are the same thing.

False

Observation are based only on what we can see.

False

Because the results were so similar, Aden decided to do a second test in which he collected additional types of information. Which changes in experimental design would best help him accept or reject his initial hypothesis?

Heart rates of the 2 groups taken during the test

The part of the experiment that the scientists changes in order to test the effects.

Independent variable

Which conclusion best supports the data collected in both experiments?

Mealworms are more strongly influenced by food than by damp or dry conditions.

Why should you perform multiple trials of experiments?

Multiple trials provide more results in order to eliminate inconsistencies due to human error and to ensure your results are valid.

Why should scientist continue to test and research current theories?

New experimental data helps increase understanding of current theories or it may disprove them and lead to new theories.

Which of the following is NOT an example of applied science?

Observing and recording data regarding tide patterns in the ocean.

If a researcher makes an experimental observation that is contrary to well-established scientific understanding, what should the next step be?

Re-evaluating the procedure and replicating the experiment

Which experimental design would provide scientists with the best data for investigating which type of feed yields the greatest gain in lean muscle mass in cattle?

Test 5 similar groups of cows with 5 different feed mixtures and measure their weight gain at the end of a 6-week trial.

Which of the following is an example of an independent variable?

Testing 2 different brands of fertilizers.

Which of the following is an example of a qualitative observation?

The bird has red feathers.

What should be included in a testable question?

The independent and dependent variables.

Which of the following is an example of basic science?

Tracking a population of deer in a specific area.

Science can change when new evidence is found.

True

Which of the following is an example of a dependent variable?

Which of the following is an example of a dependent variable?

The independent variable is the variable _____________.

manipulated by the scientist running the experiment

Does adding fertilizer have an affect on the growth rate of a plant? In this question, what is the independent variable?

the fertilizer

Susie has decided that she wants to see how different salt concentrations affect the cytoplasm of a cell. She does research on plant cells and plant cell components. Susie decides to use an onion as a source of plant cells because they stain well. A thin layer of onion is peeled off and placed on a slide. She adds one drop of distilled water and 1 drop of iodine stain and views the cells under a microscope. She then drew and identified observed structures. Next she prepared a 5% salt solution (this can be done with 5 grams of salt in 100 mL of water). She also prepared a 10% salt solution. She added a few drops of the 5% salt solution to one side of the slide and she looked at the slide again under the microscope. She drew and identified the structures. She repeated the steps with the 10% salt solution. Which slide was the control?

the slide from the first step with distilled water and the stain

A scientist wanted to learn more about population growth in bacteria. The scientist wanted to know "Does storing bacterial cultures at a lower temperature affect the growth rate of the bacterial populations?" In this scenario, what is the independent variable?

the temperature