GED Science Test #7 3

Question 1

What process do plants use to convert carbon dioxide and water into glucose using sunlight?

Accepted Answer

Photosynthesis

Answer

Cellular respiration

Answer

Fermentation

Answer

Transpiration

Question 2

A substance has a pH of 2. How would you classify this substance?

Accepted Answer

Strongly acidic

Answer

Strongly basic

Answer

Weakly basic

Answer

Neutral

Question 3

Which layer of the atmosphere contains the ozone layer that protects Earth from ultraviolet radiation?

Accepted Answer

Stratosphere

Answer

Troposphere

Answer

Mesosphere

Answer

Thermosphere

Question 4

In an experiment, a scientist changes only one variable while keeping all others constant. The variable that is changed is called the:

Accepted Answer

Independent variable

Answer

Dependent variable

Answer

Controlled variable

Answer

Hypothetical variable

Question 5

Which of the following is an example of a physical change rather than a chemical change?

Accepted Answer

Dissolving sugar in water

Answer

Burning wood

Answer

Rusting iron

Answer

Baking a cake

Question 6

What is the primary cause of the seasons on Earth?

Accepted Answer

The tilt of Earth's axis as it orbits the Sun

Answer

Earth's varying distance from the Sun

Answer

Sunspot activity on the Sun's surface

Answer

Changes in Earth's rotational speed