Achievement Test Standardized Achievement Science 2

Question 1

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

Accepted Answer

Stratosphere

Answer

The ozone layer is located in the stratosphere, roughly 15–35 km above Earth's surface.

Question 2

A student measures the mass of a rock as 50 g and its volume as 25 cm³. What is its density?

Accepted Answer

2 g/cm³

Answer

Density = mass ÷ volume = 50 g ÷ 25 cm³ = 2 g/cm³.

Question 3

Which type of rock is formed when molten magma cools and solidifies?

Accepted Answer

Igneous

Answer

Igneous rocks form from the cooling and crystallization of magma or lava.

Question 4

What is the role of decomposers in an ecosystem?

Accepted Answer

Break down dead organisms and return nutrients to the soil

Answer

Decomposers such as bacteria and fungi break down dead organic matter, recycling nutrients back into the environment.

Question 5

Which organelle is responsible for producing energy (ATP) in a cell?

Accepted Answer

Mitochondria

Answer

Mitochondria carry out cellular respiration to produce ATP, the cell's main energy currency.

Achievement Test Practice Test