GED Science Test #7 5

Question 1

What is the primary function of red blood cells in the human body?

Accepted Answer

Transporting oxygen throughout the body

Answer

Red blood cells contain hemoglobin, an iron-containing protein that binds to oxygen in the lungs and transports it to tissues throughout the body.

Question 2

Which of the following correctly describes the relationship between wavelength and frequency of electromagnetic waves?

Accepted Answer

Shorter wavelength means higher frequency

Answer

Since all electromagnetic waves travel at the same speed (speed of light), shorter wavelengths must complete more cycles per second, meaning higher frequency.

Question 3

A scientist wants to test whether a new fertilizer increases plant growth. Which variable should be kept the same in all test groups?

Accepted Answer

The type of plant used and amount of sunlight received

Answer

In a controlled experiment, all variables except the independent variable (fertilizer) must be kept constant so results can be attributed to the fertilizer alone.

Question 4

The theory of plate tectonics explains which of the following phenomena?

Accepted Answer

The formation of mountains, earthquakes, and volcanoes

Answer

Plate tectonics describes how Earth's lithospheric plates move and interact, explaining the formation of mountains at collision zones, earthquakes at fault lines, and volcanic activity.

Question 5

Which term describes the energy stored in chemical bonds of molecules like glucose?

Accepted Answer

Potential chemical energy

Answer

Chemical potential energy is stored in the bonds between atoms in molecules and is released when those bonds are broken during reactions like cellular respiration.

GED Practice Test

GED Practice Test

GED Science Test #7 5