STAAR Review

Front

What is the primary source of energy for ecosystems?

Back

The Sun is the primary source of energy for ecosystems, providing light and heat that drive photosynthesis.

Front

What is the process by which plants convert sunlight into energy?

Back

Photosynthesis is the process by which plants convert sunlight into chemical energy, producing glucose and oxygen.

Front

What is a food chain?

Back

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

Front

What is the difference between a prokaryote and a eukaryote?

Back

Prokaryotes are single-celled organisms without a nucleus (e.g., bacteria), while eukaryotes have cells with a nucleus containing DNA (e.g., plants, animals).

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

How do you calculate the mass of a substance given its density and volume?

Back

Mass = Density × Volume. For example, if the density of salt is 2.1 g/cm³ and the volume is 6 cm³, the mass is 12.6 grams.

Front

What does a distance-time graph represent?

Back

A distance-time graph shows how the distance traveled by an object changes over time, indicating speed and direction.

Front

What does a constant speed look like on a distance-time graph?

Back

A constant speed is represented by a straight line on a distance-time graph, indicating uniform motion.

Front

What is a light-year?

Back

A light-year is the distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).

Front

What is the Milky Way galaxy?

Back

The Milky Way galaxy is the galaxy that contains our solar system, consisting of billions of stars, planets, and other celestial bodies.