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Practice Of Science
Life Science
Earth Science
Physical Science
Space Science
100
Scientific knowledge may change as new evidence or information is discovered. Which of the following would NOT be a result of new scientific research and information? A. Binomial nomenclature is assigned to a recently identified plant species. B. An endangered monkey species is put in a reserve for protection from extinction. C. A newly discovered chemical element will be added to the periodic table of the elements. D. A nonnative plant species will begin to reproduce rapidly after being introduced into a swamp ecosystem.
What is D. A nonnative plant species will begin to reproduce rapidly after being introduced into a swamp ecosystem.
100
A species of chicken has alleles for black (B) or white (W) feathers. Neither of these genes is dominant. Mating between a black (BB) chicken and a white (WW) chicken produces all gray (BW) offspring. If two of the gray offspring mate, what percent of their offspring can be expected to have black feathers? ? F.25% G. 50% H. 75% I. 100%
What is F.25%
100
Deforestation occurs when large areas of trees are cut down. Which of the following impacts on the environment would result from deforestation? A. increased erosion B. colder temperatures C. excess ground moisture D. greater oxygen production
What is A. increased erosion.
100
The center region of an atom where protons and neutrons are located; also, the cell structure that contains a cell’s genetic material.
What is nucleus
100
One physical property of a star is apparent magnitude. Which of the following is used in determining the apparent magnitude of a star? A. the constellation the star is in B. the distance the star is from Earth C. the number of times the star rotates D. the number of prominences the star makes
What is B. the distance the star is from Earth
200

A statement that can be tested scientifically through experiments and/or other scientific investigations.

What is hypothesis.

200
The human body has three different kinds of muscle cells. Striated (skeletal) muscle cells move such structures as the arms and legs. Cardiac muscle cells move blood into and out of the heart. Smooth muscle cells move food through the digestive system. While each of the muscle cells performs a different job, they function in a similar way. What makes muscle cells different from other cells in the body? F. Muscle cells can hold more blood than other cells. G. Muscle cells can divide and reproduce at a faster rate than other cells. H. Muscle cells can work together to contract and relax while other cells cannot. I. Muscle cells can move freely to different parts of the body while other cells cannot.
What is H. Muscle cells can work together to contract and relax while other cells cannot.
200
The water level at the beach changes during the day. What causes the different water levels? A. Earth’s revolution B. the Moon’s rotation C. Earth’s magnetic field D. the Moon’s gravitational pull
What is D. the Moon’s gravitational pull
200
Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same column in the periodic table. Why are these elements in the same column in the periodic table? A. They are the same size. B. They react with each other. C. They have similar properties. D. They have the same number of protons.
What is C. They have similar properties.
200
The surface of Mercury has many more craters than the surface of Earth has. Which of the following statements best explains why Mercury has many more craters than Earth has? A. Mercury rotates faster than Earth does. B. Mercury has a smaller mass than Earth has. C. Mercury is much closer to the Sun than Earth is. D. Mercury has a thinner atmosphere than Earth has.
What is D. Mercury has a thinner atmosphere than Earth has.
300
Michael studied the effects of temperature and pressure on the expansion rate of gases. When publishing the results of the experiment for others to study, which of the following would be most important for Michael to include? ? A. detailed steps in the procedures used B. cost of the materials used in the study C. acknowledgement of family members D. name of the building where the experiments were performed
What is A. detailed steps in the procedures used
300
A certain reptile species is a herbivore and exists only on an isolated island. Which of the following would most likely result in the extinction of the reptile species over a period of twenty thousand years? A. The reptile species produces many offspring with many unique traits, and the vegetation remains constant. B. The reptile species produces few offspring with some unique traits, and the vegetation remains constant. C. The reptile species produces few offspring with no unique traits, and the vegetation changes quickly. D. The reptile species produces many offspring with some unique traits, and the vegetation changes slowly.
What is C. The reptile species produces few offspring with no unique traits, and the vegetation changes quickly.
300
Sunlight is composed of energy that is visible to humans and energy that is not visible to humans. Which statement describes how the visible energy from the Sun is different from the nonvisible energy? A. It travels at a different speed. B. It travels a different distance. C. It has different wavelengths. D. It has different amplitudes.
What is C. It has different wavelengths.
300
The rate at which velocity is changing. The change may involve an increase or decrease in speed and/or a change in direction. The change may be positive or negative.
What is acceleration.
300
The distance a ray of light travels in a vacuum in one year.
What is a light year.
400
Scientists once thought there was no life on the deep-sea floor due to the lack of sunlight. However, in the 1970s, complete ecosystems were discovered on the deep-sea floor that depend on energy from chemical reactions rather than energy from sunlight. Which conclusion can be drawn from this discovery? ?A. Organisms are able to survive under any conditions. B. Observations will always lead to the discovery of new organisms. C.? Organisms may be discovered in remote areas and extreme conditions. D. Observations collected on existing organisms can apply to any organism.
What is C.? Organisms may be discovered in remote areas and extreme conditions.
400
In order to maintain homeostasis, the systems of the human body work together to keep a constant internal temperature. Which of the following statements describes how the human body responds in a cold environment? A. The nervous system moves the jaw bones and causes the chattering of teeth. B. The nervous system signals the muscles of the muscular system to contract and warm the body. C. The circulatory system delivers less carbon dioxide to the muscular system, resulting in stiffening of the muscles. D. The skeletal system produces more blood cells that circulate through the blood vessels, increasing the warmth of the body.
What is B. The nervous system signals the muscles of the muscular system to contract and warm the body.
400
The climate of an area can be different from its weather. Which of the following statements describes the climate of an area? A. There should be heavy rains tomorrow morning. B. The rains next week are expected to cause some flooding. C. The average temperature from 1930–1996 was 23°C (74°F). D. The high temperature on September 4, 2009, was 32°C (89°F).
What is C. The average temperature from 1930–1996 was 23°C (74°F).
400

Luis rubbed a balloon on his hair and held the balloon next to the wall. He observed the balloon stick to the wall. Which of the following is responsible for the balloon sticking to the wall? A. friction B. gravity C. electric force D. magnetic force

What is C. electric force

400
Carol and Deborah are looking at stars on a dark night and notice that two stars next to each other are equally bright, but one is red and one is orange. Which of the following best explains why the stars are different colors? ? A. The stars are in different galaxies. B. The stars are different distances away. C.? The stars are at different stages in their life cycles. D. The stars have different numbers of planets orbiting them.
What is C.? The stars are at different stages in their life cycles.
500
An experiment was conducted in a lab to determine the effects of dioxin, a toxic chemical that causes damage to living organisms. A different concentration of dioxin was added to each of ten tanks that contained identical samples of aquatic plants in water. After a month, observations were recorded, the plants were discarded, and the solution from each tank was poured down the laboratory sink. What is the best way to improve this experiment in order to minimize the effects of dioxin on the environment? ?F. use animals rather than plants G. use a single concentration of dioxin H. review the results with another scientist I.? discard the materials at a hazardous-waste site
What is I.? discard the materials at a hazardous-waste site
500
Mushrooms, bread molds, and yeasts are classified together in the fungi kingdom. Specific characteristics are used to classify these organisms. Which of the following is a characteristic used to classify these organisms as fungi? A. They are parasites. B. They are unicellular. C. They are prokaryotes. D. They are heterotrophs.
What is D. They are heterotrophs.
500
The oldest rock formation identified on Earth is found on the shoreline of Hudson Bay in Canada. This rock formed 4.28 billion years ago. What information does a scientist need to more accurately determine the age of a rock? A. the percentage of each mineral that makes up the rock B. the thickness of younger rock layers that cover the rock C. the amount of each radioactive element present in the rock D. the amount of weathering present on the surface of the rock
What is C. the amount of each radioactive element present in the rock
500

Quinn has a container for making frozen juice bars. He pours juice into the container and then puts the container into the freezer for 12 hours. What happens to the juice molecules in the container during these 12 hours? ? A.They lose kinetic energy. B. They lose chemical energy. C. They gain electrical energy. D. They gain gravitational energy.

What is A.They lose kinetic energy.

500
12 and 14 billion years.
What is the approx. age of our universe.