Life Science
1. What is the primary function of the respiratory system?
A. To digest food
B. To pump blood
C. To exchange gases
D. To regulate temperature
C. To exchange gases
3. What is the main purpose of a control group in an experiment?
A. To receive extra treatment
B. To be used for comparison
C. To manipulate variables
D. To increase the sample size
B. To be used for comparison
4. Which planet is known for having a large red storm and many moons?
A. Mars
B. Saturn
C. Jupiter
D. Neptune
C. Jupiter
5. Water boiling is an example of:
A. A chemical change
B. A nuclear reaction
C. A physical change
D. Photosynthesis
C. A physical change
16. Fossil fuels are considered nonrenewable because:
A. They cause pollution
B. They are expensive
C. They form very slowly
D. They can be reused
C. They form very slowly
2. Which organelle is known as the "powerhouse of the cell"?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Golgi apparatus
C. Mitochondrion
11. Which of these best describes a hypothesis?
A. A proven fact
B. A testable prediction
C. A law of nature
D. A scientific theory
B. A testable prediction
6. Which type of rock is formed from lava or magma?
A. Sedimentary
B. Igneous
C. Metamorphic
D. Fossilized
B. Igneous
9. Which of the following is an example of kinetic energy?
A. A stretched rubber band
B. A rock at the top of a hill
C. A rolling ball
D. A battery
C. A rolling ball
17. In a food chain, what type of organism is a deer?
A. Producer
B. Primary consumer
C. Secondary consumer
D. Decomposer
B. Primary consumer
8. Which gas do plants take in during photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Methane
B. Carbon dioxide
Which of the following is the correct order of steps in the scientific method?
A. Observation → Hypothesis → Experiment → Conclusion → Theory
B. Hypothesis → Observation → Experiment → Conclusion → Theory
C. Observation → Experiment → Hypothesis → Conclusion → Theory
D. Observation → Hypothesis → Experiment → Conclusion → Theory
D. Observation → Hypothesis → Experiment → Conclusion → Theory
7. What causes the seasons on Earth?
A. The distance from the sun
B. Earth’s tilted axis
C. The phases of the moon
D. Solar flares
B. Earth’s tilted axis
12. The force that attracts objects toward Earth is called:
A. Friction
B. Magnetism
C. Inertia
D. Gravity
D. Gravity
18. Which of the following best describes natural selection?
A. Humans choosing traits to breed
B. Survival of the best-fed
C. Random changes in DNA
D. Favorable traits becoming more common over time
D. Favorable traits becoming more common over time
10. In genetics, what does DNA stand for?
A. Dynamic Nucleic Acid
B. Deoxyribonucleic Acid
C. Digital Nucleic Array
D. Double Nucleus Agent
B. Deoxyribonucleic Acid
In an experiment, if a researcher changes the temperature of water to test its effect on plant growth, which of the following is the independent variable?
A. The type of plant used
B.The temperature of the water
C. The amount of sunlight the plant receives
D. The size of the plant
B. The temperature of the water
Explanation: The independent variable is the one that the experimenter changes. In this case, the temperature of the water is being altered to test its effect on plant growth, so it is the independent variable.
22. The Moon appears to change shape because of:
A. Earth's shadow
B. Moon’s rotation
C. Sun’s brightness
D. Phases caused by its orbit
D. Phases caused by its orbit
13. The atomic number of an element is determined by the number of:
A. Protons
B. Electrons
C. Neutrons
D. Ions
A. Protons
20. The process by which liquid water becomes vapor is:
A. Condensation
B. Sublimation
C. Evaporation
D. Freezing
C. Evaporation
14. Which of the following diseases is caused by a virus?
A. Tuberculosis
B. Influenza
C. Strep throat
D. Lyme disease
B. Influenza
Scientists collected data on plant growth given fertilizer. The plants grew the following height: 6cm, 7cm, 6cm, 8cm, 9cm, and 5cm. What is the mean, median, mode, and range of the growth of the plants given fertilizer? Round your answers to the nearest hundredth.
Mean (average) 6.83cm
Median 6.50cm
Mode 6cm
Range 4cm
Which of the following best describes the composition of Earth’s atmosphere?
A. Mostly nitrogen and oxygen with small amounts of carbon dioxide, water vapor, and other gases
B. Mostly carbon dioxide and oxygen with small amounts of nitrogen
C. Equal amounts of nitrogen, oxygen, and carbon dioxide
D. Mostly water vapor with small amounts of nitrogen and oxygen
A. Mostly nitrogen and oxygen with small amounts of carbon dioxide, water vapor, and other gases
Explanation: Earth's atmosphere is composed about 78% nitrogen, 21% oxygen, and small amounts of other gases like carbon dioxide, argon, and water vapor.
15. What is the unit of electrical resistance?
A. Volt
B. Watt
C. Ohm
D. Ampere
C. Ohm
21. Which of the following is a renewable resource?
A. Coal
B. Natural gas
C. Wind
D. Uranium
C. Wind