AASA Science and Technology 2

Question 1

What is the role of decomposers in an ecosystem?

Accepted Answer

To break down dead organisms and recycle nutrients

Answer

Decomposers such as bacteria and fungi break down dead organisms, returning nutrients to the soil.

Question 2

What does DNA stand for?

Accepted Answer

Deoxyribonucleic Acid

Answer

DNA stands for Deoxyribonucleic Acid, the molecule that carries genetic information in living organisms.

Question 3

Which layer of Earth is the thickest?

Accepted Answer

Mantle

Answer

The mantle is the thickest layer of Earth, extending about 1,800 miles below the crust.

Question 4

What is a food chain?

Accepted Answer

A sequence showing how energy moves from one organism to another

Answer

A food chain shows the linear transfer of energy through feeding relationships, starting with producers.

Question 5

Which gas do humans exhale?

Accepted Answer

Carbon dioxide

Answer

Humans exhale carbon dioxide as a waste product of cellular respiration.

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