State Test Practice Science 2

Question 1

Which layer of Earth's atmosphere contains the ozone layer?

Accepted Answer

Stratosphere

Answer

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?

Accepted Answer

Atoms are rearranged to form new substances

Answer

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?

Accepted Answer

A food chain shows one path of energy flow; a food web shows multiple interconnected paths

Answer

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?

Accepted Answer

Solar power

Answer

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?

Accepted Answer

To control cell activities and store genetic information (DNA)

Answer

The nucleus acts as the control center of the cell, housing DNA and directing cellular activities.

State Test Practice Practice Test