State Test Practice Science 2 — Questions and Answers
Question 1: Which layer of Earth's atmosphere contains the ozone layer?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, approximately 15–35 km above Earth's surface.
Question 2: What happens to atoms during a chemical reaction?
- Atoms are created from nothing
- Atoms are destroyed
- Atoms are rearranged to form new substances (Correct answer)
- Atoms change from one element to another
Correct answer: Atoms are rearranged to form new substances
In a chemical reaction, atoms are rearranged and bonds are broken and formed to create new substances.
Question 3: What is the difference between a food chain and a food web?
- A food chain shows one path of energy flow; a food web shows multiple interconnected paths (Correct answer)
- They are the same thing
- A food chain includes decomposers; a food web does not
- A food web only applies to ocean ecosystems
Correct answer: A food chain shows one path of energy flow; a food web shows multiple interconnected paths
A food chain is a single linear sequence of who eats whom, while a food web represents all interconnected food chains in an ecosystem.
Question 4: Which of these is a renewable energy source?
- Coal
- Natural gas
- Solar power (Correct answer)
- Oil
Correct answer: Solar power
Solar power is renewable because it relies on the sun's energy, which is continuously replenished.
Question 5: What is the function of the nucleus in a cell?
- To produce proteins
- To control cell activities and store genetic information (DNA) (Correct answer)
- To generate energy for the cell
- To transport materials across the cell membrane
Correct answer: To control cell activities and store genetic information (DNA)
The nucleus acts as the control center of the cell, housing DNA and directing cellular activities.
Question 6: What type of wave requires a medium to travel through?
- Electromagnetic waves
- Light waves
- Radio waves
- Mechanical waves (Correct answer)
Correct answer: Mechanical waves
Mechanical waves, such as sound waves, require a physical medium (solid, liquid, or gas) to propagate.
State Test Practice Science 2
Which layer of Earth's atmosphere contains the ozone layer?