Biology Unit 1 Review Expanded
Questions and Answers
- 1.
Which of the following is an example of a safe laboratory procedure?
- A.
Tying back long hair and binding loose clothes.
- B.
Eating and drinking from lab glassware.
- C.
Checking the temperature of an object with a light touch.
- D.
Testing an odor by directly inhaling the vapor.
Correct Answer
A. Tying back long hair and binding loose clothes.Explanation
Tying back long hair and binding loose clothes is an example of a safe laboratory procedure because it helps prevent accidents and injuries. Loose hair and clothing can easily catch fire or get tangled in equipment, causing harm to the person and potentially leading to spills or breakages. By securing long hair and wearing fitted clothing, the risk of accidents is reduced, ensuring a safer working environment in the laboratory.Rate this question:
-
- 2.
In scientific experiments, only one variable is tested at a time. What is this called?
- A.
An inference
- B.
An observation
- C.
A variable experiment
- D.
A controlled experiment 4
Correct Answer
D. A controlled experiment 4Explanation
A controlled experiment is when only one variable is tested at a time in scientific experiments. This allows researchers to isolate and manipulate the variable being tested, while keeping all other variables constant. By doing so, they can determine the specific effect of the variable on the outcome of the experiment.Rate this question:
-
- 3.
How is homeostasis achieved by an organism?
- A.
By using feedback from the body.
- B.
Through cell division.
- C.
After DNA in cells is able to replicate itself.
- D.
After an organism is able to produce offspring.
Correct Answer
A. By using feedback from the body.Explanation
Homeostasis is the process by which an organism maintains a stable internal environment. This is achieved by using feedback from the body, which allows the organism to monitor and adjust its physiological processes in response to changes in the external or internal environment. Feedback mechanisms, such as negative feedback loops, help regulate variables such as temperature, pH levels, and hormone levels, ensuring that they remain within a narrow range. By constantly monitoring and adjusting these variables, the organism can maintain its internal balance and ensure its survival and proper functioning.Rate this question:
-
- 4.
An ocular lens with a magnification of 10x and an objective lens with a magnification of 50x together will magnify an object by
- A.
60x
- B.
100x
- C.
250x.
- D.
500x
Correct Answer
D. 500xExplanation
The ocular lens with a magnification of 10x and the objective lens with a magnification of 50x work together to increase the overall magnification. To calculate the total magnification, we multiply the magnification of the ocular lens by the magnification of the objective lens. Therefore, 10x multiplied by 50x equals a total magnification of 500x.Rate this question:
-
- 5.
A scientific experiment must have the following features:
- A.
A control, so variables that may affect the outcome are reduced.
- B.
The variable being tested reflects the question being asked.
- C.
The variable being tested can be measured accurately.
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The correct answer is "all of the above". This means that a scientific experiment must have all the features mentioned in the options. It must have a control to reduce the variables that may affect the outcome. The variable being tested should reflect the question being asked, ensuring that the experiment is relevant. Additionally, the variable being tested should be measurable accurately, allowing for precise observations and data collection.Rate this question:
-
- 6.
In the general process of a scientific investigation, what comes after an observation?
- A.
Experiment
- B.
Measurement
- C.
Hypothesis
- D.
Theory
Correct Answer
C. HypothesisExplanation
After making an observation in a scientific investigation, the next step is to formulate a hypothesis. A hypothesis is a proposed explanation or prediction based on the observation. It is an educated guess that can be tested through experiments and measurements to determine its validity. The hypothesis serves as a starting point for further investigation and helps guide the design of experiments and collection of data.Rate this question:
-
- 7.
A hypothesis
- A.
Is a suggested explanation for a phenomena based on evidence that can be tested by observation or experimentation.
- B.
Is a guess.
- C.
Is based on what a scientist thinks could happen.
- D.
is an explanation of a scientific concept.
Correct Answer
A. Is a suggested explanation for a phenomena based on evidence that can be tested by observation or experimentation.Explanation
A hypothesis is a suggested explanation for a phenomena based on evidence that can be tested by observation or experimentation. It is not just a guess or based on what a scientist thinks could happen. It is a specific statement that can be tested and either proven or disproven through scientific methods.Rate this question:
-
- 8.
A scientific theory
- A.
Describes a guess or an opinion.
- B.
Is supported by a great deal of data and evidence.
- C.
Is the process of scientific investigation.
- D.
Is just another name for a hypothesis.
Correct Answer
B. Is supported by a great deal of data and evidence.Explanation
A scientific theory is not just a guess or an opinion, but rather a well-supported explanation that is based on a substantial amount of data and evidence. It goes beyond a hypothesis, which is an initial explanation that is yet to be tested and proven. A scientific theory is the result of rigorous scientific investigation and is supported by extensive research and empirical evidence.Rate this question:
-
- 9.
Which of the following are not true of a scientific law?
- A.
Is a principle which can be used to predict the behavior of the natural world.
- B.
Is well-supported by observations and/or experimental evidence.
- C.
Is the same as a scientific theory.
- D.
Usually refers to rules for how nature will behave under certain conditions.
Correct Answer
C. Is the same as a scientific theory.Explanation
A scientific law is a principle that can be used to predict the behavior of the natural world. It is well-supported by observations and/or experimental evidence. However, it is not the same as a scientific theory. A scientific theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence. While a scientific law describes a phenomenon, a scientific theory explains why and how that phenomenon occurs. Therefore, the statement "Is the same as a scientific theory" is not true of a scientific law.Rate this question:
-
- 10.
At what temperature does water boil (Celcius)?
- A.
0
- B.
24
- C.
37
- D.
100
- E.
212
Correct Answer
D. 100Explanation
Water boils at 100 degrees Celsius. This is the point at which water changes from a liquid to a gas, forming bubbles and releasing steam. Boiling point is a characteristic property of a substance and is influenced by factors such as atmospheric pressure. In the case of water, at sea level, it boils at 100 degrees Celsius. However, at higher altitudes where the atmospheric pressure is lower, the boiling point of water decreases.Rate this question:
-
- 11.
Convert 4.56 l to cl.
- A.
.0456
- B.
.456
- C.
45.6
- D.
456
- E.
4 560
Correct Answer
D. 456Explanation
To convert liters (l) to centiliters (cl), you need to multiply the given value by 100. In this case, 4.56 liters multiplied by 100 equals 456 centiliters.Rate this question:
-
- 12.
Convert .045 km to mm
- A.
.000 0045
- B.
45
- C.
4 500
- D.
45 000
Correct Answer
D. 45 000Explanation
To convert kilometers to millimeters, you need to multiply the given value by 1,000,000 (since there are 1,000,000 millimeters in a kilometer). Therefore, 0.045 km is equal to 45,000 mm.Rate this question:
-
- 13.
What does 'kilo' mean?
- A.
1/1000
- B.
1/100
- C.
1
- D.
100
- E.
1000
Correct Answer
E. 1000Explanation
The correct answer is 1000. In the metric system, "kilo" is a prefix that denotes a factor of 1000. Therefore, when referring to "kilo" in terms of measurement, it means multiplying the base unit by 1000. For example, a kilogram is equal to 1000 grams, and a kilometer is equal to 1000 meters.Rate this question:
-
- 14.
What do you do to start focusing a microscope?
- A.
Turn to high objective lens
- B.
Raise low objective as high as possible then put slide on stage
- C.
Lower objective then place slide on stage
- D.
Start of medium objective then insert the slide
Correct Answer
B. Raise low objective as high as possible then put slide on stageExplanation
To start focusing a microscope, you need to raise the low objective lens as high as possible and then place the slide on the stage. This is because the low objective lens provides the lowest magnification, so by raising it to its highest position, you can start with a broader view of the specimen on the slide. Placing the slide on the stage ensures that the specimen is in the correct position for observation and focusing.Rate this question:
-
- 15.
What do you do with broken glass?
- A.
Put in trash immediately, cleaning up any small bits of glass
- B.
Clean up with paper towels, but don't touch with your hands
- C.
Tell teacher then put in box in back of room
- D.
Always recycle
Correct Answer
C. Tell teacher then put in box in back of roomExplanation
The correct answer suggests that when you have broken glass, you should inform your teacher and then place the broken glass in a box located at the back of the room. This is a safe and responsible way to handle broken glass, as it ensures that no one accidentally gets hurt and that the glass is properly contained.Rate this question:
-
- 16.
According to this graph, which of the following is the Independent Variable?
- A.
Plant Growth
- B.
Time
- C.
No Magnet
- D.
Presence of Magnet
- E.
Soil
Correct Answer
D. Presence of MagnetExplanation
The independent variable is the one that is manipulated or changed in an experiment. In this case, the presence or absence of a magnet is the only option that fits this definition. The other variables listed, such as plant growth, time, and soil, are not being intentionally manipulated or changed in the experiment. Therefore, the presence of a magnet is the independent variable in this scenario.Rate this question:
-
- 17.
An survey is conducted to see if children who eat strawberries early in life have fewer allergies than children who avoid strawberries. In this survey, what is the independent variable?
- A.
Children
- B.
Eating Strawberries Early in Life
- C.
Childhood Allergies
- D.
Adult Allergies
Correct Answer
B. Eating Strawberries Early in LifeExplanation
The independent variable in this survey is "Eating Strawberries Early in Life". This is because the researchers are interested in studying the impact of this specific factor on the development of allergies in children. They want to see if there is a correlation between eating strawberries early in life and having fewer allergies. By manipulating the independent variable (exposure to strawberries), the researchers can observe any potential changes in the dependent variable (allergies) and determine if there is a causal relationship between the two.Rate this question:
-
- 18.
What is body temperature in Celcius?
- A.
0
- B.
21
- C.
37
- D.
98.6
- E.
100
Correct Answer
C. 37Explanation
The correct answer is 37. This is the average normal body temperature in Celsius for a healthy adult.Rate this question:
-
- 19.
If you are trying to focus on a very, very small object on a microscope slide, what will you likely need to do to the diagphram?
- A.
Open it, small objects needs more magnification
- B.
Open it, small objects need a lot of light
- C.
Reduce it, small objects need less magnification
- D.
Reduce it, small objects don't need as much light
Correct Answer
D. Reduce it, small objects don't need as much lightExplanation
To focus on a very small object on a microscope slide, it is necessary to reduce the diaphragm. This is because small objects do not require as much light as larger objects. By reducing the diaphragm, the amount of light entering the microscope is decreased, allowing for better visibility and focus on the small object.Rate this question:
-
- 20.
According to this table, what variable should be placed on the X-axis if these data are graphed?
- A.
PH of Water
- B.
Number of Tadpoles
- C.
Does Water pH Affect Tadpoles
- D.
45, 69, 78, 88, 43, 23
Correct Answer
A. PH of WaterExplanation
The variable that should be placed on the X-axis if these data are graphed is the pH of Water. This is because the pH of Water is the independent variable in this scenario, and it is typically plotted on the X-axis in a graph. The number of Tadpoles would be the dependent variable and would be plotted on the Y-axis. The data provided represents the relationship between the pH of water and the number of tadpoles, suggesting that the pH of water is being manipulated or controlled to observe its effect on the number of tadpoles.Rate this question:
-
- 21.
What means '1000'
- A.
Milli
- B.
Centi
- C.
Deci
- D.
Kilo
Correct Answer
D. KiloExplanation
The prefix "kilo" is used to denote a factor of 1000. Therefore, when we say "1000", it means "kilo".Rate this question:
-
- 22.
What is the metric unit for volume?
- A.
Meter
- B.
Liter
- C.
Gram
- D.
Celcius
Correct Answer
B. LiterExplanation
The metric unit for volume is liter. Volume is a measure of the amount of space occupied by a substance or object. The liter is a unit of volume in the metric system and is commonly used to measure the volume of liquids. It is equal to one cubic decimeter and is often abbreviated as "L". The other options, meter, gram, and Celsius, are units of length, mass, and temperature respectively, and are not used to measure volume.Rate this question:
-
- 23.
What is the metric unit for mass?
- A.
Meter
- B.
Liter
- C.
Gram
- D.
Celcius
Correct Answer
C. GramExplanation
The metric unit for mass is gram. Mass is a measure of the amount of matter in an object, and the gram is the standard unit for measuring mass in the metric system. The other options, meter, liter, and Celsius, are units for measuring length, volume, and temperature respectively, and are not directly related to mass.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 16, 2015Quiz Created by
Justin Lovrien
Back to top