OAA Science 3 — Questions and Answers
Question 1: A food web shows that rabbits eat grass and foxes eat rabbits. If the grass population suddenly decreases, what would most likely happen to the fox population?
- It would increase
- It would stay the same
- It would decrease (Correct answer)
- It would not be affected
Correct answer: It would decrease
Fewer grass leads to fewer rabbits, which means less food for foxes, causing the fox population to decrease.
Question 2: Which of the following is a renewable energy resource?
- Coal
- Natural gas
- Petroleum
- Wind (Correct answer)
Correct answer: Wind
Wind energy is renewable because wind is continuously replenished by natural atmospheric processes.
Question 3: An atom has 6 protons, 6 neutrons, and 6 electrons. What element is it?
- Nitrogen
- Carbon (Correct answer)
- Oxygen
- Boron
Correct answer: Carbon
The number of protons (atomic number = 6) identifies the element as Carbon.
Question 4: Which moon phase occurs when the Moon is between Earth and the Sun?
- Full moon
- New moon (Correct answer)
- First quarter
- Waning gibbous
Correct answer: New moon
During a new moon, the Moon is aligned between Earth and the Sun, so its illuminated side faces away from Earth.
Question 5: What is the correct order of the steps of the scientific method?
- Hypothesis, Observation, Experiment, Conclusion
- Observation, Hypothesis, Experiment, Conclusion (Correct answer)
- Experiment, Hypothesis, Observation, Conclusion
- Conclusion, Observation, Hypothesis, Experiment
Correct answer: Observation, Hypothesis, Experiment, Conclusion
Scientists first observe, form a hypothesis, conduct an experiment, then draw a conclusion.
Question 6: Which type of wave requires a medium (matter) to travel through?
- Radio wave
- Light wave
- Sound wave (Correct answer)
- X-ray
Correct answer: Sound wave
Sound is a mechanical wave and needs a medium such as air, water, or solids to propagate.
Question 7: A scientist observes that a species of bird has a beak shape perfectly suited for cracking hard seeds. This is an example of:
- Hibernation
- Migration
- Adaptation (Correct answer)
- Symbiosis
Correct answer: Adaptation
An adaptation is a trait that improves an organism's ability to survive and reproduce in its environment.
OAA Science 3
A food web shows that rabbits eat grass and foxes eat rabbits.
If the grass population suddenly decreases, what would most likely happen to the fox population?