GED Science Test #7 2

Question 1

Which organelle is responsible for producing ATP through cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondria

Answer

Mitochondria are called the powerhouse of the cell because they generate most of the cell's supply of ATP through the process of cellular respiration.

Question 2

A car travels 150 miles in 3 hours and then 120 miles in 2 hours. What is the car's average speed for the entire trip?

Accepted Answer

54 mph

Answer

Average speed = total distance ÷ total time = (150 + 120) ÷ (3 + 2) = 270 ÷ 5 = 54 mph.

Question 3

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They break down dead organic matter and recycle nutrients

Answer

Decomposers such as bacteria and fungi break down dead organisms and organic waste, returning nutrients like nitrogen and carbon back into the soil and atmosphere for reuse by producers.

Question 4

Earth's layers from outermost to innermost are:

Accepted Answer

Crust, mantle, outer core, inner core

Answer

Earth is structured in concentric layers: the thin solid crust on the outside, followed by the thick mantle, then the liquid outer core, and finally the solid inner core at the center.

Question 5

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Answer

A covalent bond is formed when two atoms share one or more pairs of electrons. This type of bonding is common in molecules like water (H₂O) and carbon dioxide (CO₂).

GED Practice Test

GED Practice Test

GED Science Test #7 2