Stem Ch 1 Online Test
Covers the properties of life, organization of life, the scientific method and the microscope.
Questions and Answers
- 1.
What is the spontaneous generation theory?
- 2.
What is a hypothesis?
- A.
A theory
- B.
An educated guess
- C.
A Fact
- D.
An inference
- E.
An observation
Correct Answer
B. An educated guessExplanation
A hypothesis is an educated guess because it is a proposed explanation or prediction based on limited evidence or prior knowledge. It is not yet proven or established as a fact, but it serves as a starting point for further investigation and experimentation. A hypothesis is formulated by making logical deductions or inferences from available information, but it requires further testing and evidence to either support or refute it.Rate this question:
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- 3.
Which sentence best describes the importance of using a control group?
- A.
When you use a control group you don't need a large sample size.
- B.
When you have a control group you don't have to do any calculations.
- C.
Control groups allow you to compare those recieving the variable and those that are not.
Correct Answer
C. Control groups allow you to compare those recieving the variable and those that are not.Explanation
Using a control group is important because it allows for a comparison between the group that receives the variable being tested and the group that does not. This comparison helps to determine the true effect of the variable by isolating its impact from other factors. By having a control group, researchers can establish a baseline and assess the difference in outcomes between the experimental group and the control group. This helps to ensure that any observed effects are actually due to the variable being tested and not due to other factors.Rate this question:
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- 4.
The measurable factor in an experiment is known as the
- A.
Independent variable.
- B.
Dependent variable
- C.
Controlled variable
Correct Answer
B. Dependent variableExplanation
The dependent variable is the measurable factor in an experiment that is affected or influenced by the independent variable. It is the variable that researchers observe and measure to determine the effect or outcome of the experiment. In other words, the dependent variable "depends" on the independent variable and changes as a result of it. Therefore, the correct answer is dependent variable.Rate this question:
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- 5.
Suzy wanted to know if thicker candles burn longer than thinner candles. Her hypothesis was that if she used a thick candle that it would burn for the longest amount of time. She got ten candles that were all the same brand, height, smell, and color. The only difference in the candles was they were all a different size, She lit them at the same time and recorded how long it took for each candle to burn out. What was her independent variable?
- A.
Thickness of the candle
- B.
Length of time the candle burned
- C.
Color of the candle
Correct Answer
A. Thickness of the candleExplanation
The independent variable in this experiment is the thickness of the candle. Suzy is testing whether the thickness of the candle affects how long it burns. She keeps all other variables constant (brand, height, smell, and color) and only changes the thickness of the candles. By lighting them at the same time and recording the time it takes for each candle to burn out, she can compare the results and determine if there is a correlation between thickness and burn time.Rate this question:
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- 6.
Janet wanted to see if the height of a person affected the length of their handspan. She measured three people's heights, and measured their handspans. She found that the taller a person is, the longer their handspan is. What is wrong with her experiment?
- A.
She tested too many variables at once.
- B.
She did not test a large enough sample of people.
- C.
She did not control all of the variables.
Correct Answer
B. She did not test a large enough sample of people.Explanation
The correct answer is that Janet did not test a large enough sample of people. In order to draw accurate conclusions, it is important to have a sufficiently large sample size that represents the population being studied. Only testing three people may not provide enough data to establish a strong correlation between height and handspan length. By testing a larger sample size, Janet would have a more reliable basis for her findings.Rate this question:
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- 7.
Which hypothesis would have been supported by the data from this graph?
- A.
If Stride is chewed, then most kids will like it.
- B.
If Hubba Bubba is chewed, then the flavor will last the longest.
- C.
If Big red is chewed, then it will have the smallest bubble.
Correct Answer
C. If Big red is chewed, then it will have the smallest bubble.Explanation
The graph likely shows the sizes of bubbles produced by different chewing gum brands. The data suggests that when Big Red is chewed, it consistently produces the smallest bubble compared to other brands. This supports the hypothesis that if Big Red is chewed, then it will have the smallest bubble.Rate this question:
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- 8.
A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the growth of the corn over the course of 5 months. What is one controlled variable in this experiment?
- A.
Amount of water
- B.
Growth of corn
- C.
Type of fertilizer
Correct Answer
A. Amount of waterExplanation
In this experiment, the scientist is testing the effect of fertilizer on the growth of corn. Therefore, the type of fertilizer is the independent variable, as it is being manipulated by the scientist. The growth of corn is the dependent variable, as it is being measured and observed as a result of the different treatments. The controlled variable in this experiment is the amount of water, as both rows of corn receive the same amount of water. By keeping this variable constant, the scientist can ensure that any differences in the growth of corn are due to the presence or absence of fertilizer.Rate this question:
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- 9.
What would be a controlled variable in the experiment from this graph?
- A.
Number of times gum is chewed
- B.
Brand of bubble gum
- C.
Size of bubble
Correct Answer
A. Number of times gum is chewedExplanation
The controlled variable in this experiment would be the number of times gum is chewed. This means that throughout the experiment, the researchers will keep the number of times gum is chewed constant for all the different brands of bubble gum being tested. By controlling this variable, they can ensure that any differences observed in the size of the bubble can be attributed to the brand of bubble gum rather than the number of times it is chewed.Rate this question:
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- 10.
Biology is the study of
- A.
Minerals
- B.
Life
- C.
The weather
- D.
Energy
Correct Answer
B. LifeExplanation
Biology is the study of life. It encompasses the study of living organisms, their structure, function, growth, evolution, and interactions with the environment. This field of science focuses on understanding the various aspects of life, including its origins, diversity, and processes. By studying biology, scientists gain insights into the fundamental principles and mechanisms that govern life on Earth.Rate this question:
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- 11.
Homeostasis in simpler terms means
- A.
A change over long periods of time
- B.
Keeping things the same
- C.
Rapid change
- D.
The same thing as evolution
Correct Answer
B. Keeping things the sameExplanation
Homeostasis refers to the ability of an organism or system to maintain a stable internal environment despite external changes. It involves various physiological processes that work together to regulate temperature, pH levels, blood sugar levels, and other vital parameters within a narrow range. By "keeping things the same," homeostasis ensures that an organism's internal conditions remain balanced and suitable for proper functioning. This allows the organism to adapt and respond to external stimuli while maintaining internal stability.Rate this question:
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- 12.
Which of the following is NOT necessarily a characteristic of living things?
- A.
Homeostasis
- B.
Metabolism
- C.
Complexity
- D.
Reproduction
Correct Answer
C. ComplexityExplanation
Complexity is not necessarily a characteristic of living things because there are many simple organisms that are considered living. Complexity refers to the level of organization and intricacy within an organism, but it is not a defining characteristic of life. Living things can range from simple single-celled organisms to complex multicellular organisms, so complexity is not a requirement for something to be considered alive.Rate this question:
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- 13.
The smallest units that can carry on all the functions of life are called
- A.
Molecules
- B.
Cells
- C.
Organelles
- D.
Species
Correct Answer
B. CellsExplanation
Cells are the smallest units that can carry out all the functions of life. They are the basic building blocks of all living organisms. Cells have the ability to grow, reproduce, respond to stimuli, and carry out metabolic processes. They can also maintain homeostasis and adapt to their environment. Molecules are made up of atoms and are not capable of carrying out all the functions of life on their own. Organelles are structures within cells that perform specific functions, but they are not considered the smallest units of life. Species refers to a group of organisms that can interbreed and produce fertile offspring, which is not related to the smallest units of life.Rate this question:
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- 14.
An educated guess, or a(an) ________________________, may be tested by experimentation.
Correct Answer
hypothesis, HypothesisExplanation
A hypothesis is an educated guess that can be tested through experimentation. It is a statement or prediction that is based on prior knowledge or observations. By conducting experiments, scientists can gather data to support or refute the hypothesis. The word "hypothesis" is used to refer to both the singular and plural forms.Rate this question:
- 15.
A ____________________ experiment is one in which the condition suspected to cause the effect is compared to the same situation without the suspected condition.
Correct Answer
controlled, controlExplanation
A controlled experiment is one in which the condition suspected to cause the effect is compared to the same situation without the suspected condition. In a controlled experiment, all other variables are kept constant except for the variable being tested. This allows researchers to isolate and determine the specific effect of the suspected condition on the outcome. The control group serves as a baseline for comparison, providing a reference point to measure the effects of the condition being tested.Rate this question:
- 16.
A living things that has more than one cell is called _________________________.
Correct Answer
multicellular, multi cellularExplanation
A living thing that has more than one cell is called multicellular or multi cellular. This means that the organism is composed of multiple cells working together to form tissues, organs, and organ systems. Examples of multicellular organisms include plants, animals, and fungi. These organisms have specialized cells that perform specific functions, allowing for complex biological processes and the ability to adapt to different environments.Rate this question:
- 17.
The variable that is changed on purpose, also called the independent variable is known as the _______________ variable.
Correct Answer
manipulativeExplanation
The variable that is changed on purpose, also called the independent variable is known as the manipulative variable. This variable is intentionally manipulated or controlled by the researcher in order to observe its effect on the dependent variable. By altering the manipulative variable, the researcher can determine the cause and effect relationship between variables in an experiment.Rate this question:
- 18.
According to the organization of life, what term is after biological molecule (macromolecule), but before cell?
Correct Answer
organelleExplanation
In the organization of life, after biological molecules (macromolecules) comes the organelle. An organelle is a specialized structure within a cell that performs specific functions. It is a smaller functional unit within a cell and is responsible for carrying out various processes necessary for the cell's survival and functioning. Therefore, organelles are the next level of organization after biological molecules and serve as the building blocks of cells.Rate this question:
- 19.
What would be an inference to the picture?
Correct Answer
Someone stepped on a nail.Explanation
The inference to the picture is that someone stepped on a nail. This can be deduced from the fact that the picture shows a nail on the ground, suggesting that it may have caused injury to someone who accidentally stepped on it.Rate this question:
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Mar 20, 2023Quiz Edited by
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Sep 09, 2014Quiz Created by
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