PSSA PSSA Science 2

Question 1

Which of the following best describes a food chain?

Accepted Answer

A sequence showing how energy passes from one organism to another

Answer

A food chain shows the sequence in which energy is transferred from one organism to another through feeding relationships.

Question 2

What is the difference between a mixture and a compound?

Accepted Answer

A mixture is physically combined and can be separated, while a compound is chemically bonded

Answer

A mixture is a physical combination of substances that can be separated, while a compound involves chemical bonding of elements in fixed ratios.

Question 3

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

Accepted Answer

Stratosphere

Answer

The ozone layer is located in the stratosphere, approximately 15 to 35 kilometers above Earth's surface.

Question 4

What process do plants use to make their own food?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process by which plants convert light energy, water, and carbon dioxide into glucose and oxygen.

Question 5

Which of the following is NOT a renewable energy source?

Accepted Answer

Natural gas

Answer

Natural gas is a fossil fuel, making it a nonrenewable energy source that cannot be replenished on a human timescale.

PSSA - Pennsylvania System of School Assessment Practice Test