Science Study Guide

The Sun is one of ________ of stars in the universe.

• billions

• dozens

• hundreds

• thousands

Which is the closest star to Earth?

• The Moon

• The Sun

• Alpha Centauri

• Mars

The Sun is made of ________ and is classified as a star because it provides light energy to the solar system.

• gases

• rocks

• liquids

• metals

True or False: The Sun is the largest object in our solar system, but many other stars in the universe are much larger.

• True

• False

The Sun is considered an ________-sized star compared to other stars.

• average

• giant

• tiny

• supermassive

Why does the Sun look large to us?

• It is the largest star in the universe

• It is much closer than any other star

• It is made of gases

• It is the only star in the solar system

The Sun is the major source of ________ for ecosystems.

• energy

• water

• carbon dioxide

• minerals

Which of the following is a role of producers in the ecosystem?

• Eat other organisms

• Use energy from the Sun to make their own food

• Break down dead organisms

• Consume producers

Consumers must ________ to get energy.

• eat other organisms

• make their own food

• absorb sunlight directly

• photosynthesize

Decomposers break down dead organisms and waste, returning ________ to the soil.

• nutrients

• energy

• sunlight

• carbon dioxide