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 cycle showing how water moves through an ecosystem

Answer

A diagram of all organisms living in a habitat

Answer

A chart showing population sizes over time

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 has fixed ratios while a compound does not

Answer

A compound is physically combined while a mixture is chemically bonded

Answer

There is no difference between mixtures and compounds

Question 3

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

Accepted Answer

Stratosphere

Answer

Troposphere

Answer

Mesosphere

Answer

Thermosphere

Question 4

What process do plants use to make their own food?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Fermentation

Answer

Decomposition

Question 5

Which of the following is NOT a renewable energy source?

Accepted Answer

Natural gas

Answer

Solar energy

Answer

Wind energy

Answer

Hydropower

Question 6

What is Newton's Third Law of Motion?

Accepted Answer

For every action there is an equal and opposite reaction

Answer

An object in motion stays in motion unless acted upon by an outside force

Answer

Force equals mass times acceleration

Answer

Objects with greater mass have greater inertia