AASA Science and Technology 2 — Questions and Answers
Question 1: What is the role of decomposers in an ecosystem?
- To produce food through photosynthesis
- To break down dead organisms and recycle nutrients (Correct answer)
- To consume plants as the primary consumer
- To convert sunlight into chemical energy
Correct answer: To break down dead organisms and recycle nutrients
Decomposers such as bacteria and fungi break down dead organisms, returning nutrients to the soil.
Question 2: What does DNA stand for?
- Deoxyribonucleic Acid (Correct answer)
- Dynamic Nitrogen Amplifier
- Direct Neural Activity
- Deoxygenated Nucleotide Array
Correct answer: Deoxyribonucleic Acid
DNA stands for Deoxyribonucleic Acid, the molecule that carries genetic information in living organisms.
Question 3: Which layer of Earth is the thickest?
- Crust
- Inner core
- Outer core
- Mantle (Correct answer)
Correct answer: Mantle
The mantle is the thickest layer of Earth, extending about 1,800 miles below the crust.
Question 4: What is a food chain?
- The movement of water through an ecosystem
- A sequence showing how energy moves from one organism to another (Correct answer)
- A list of all animals in a habitat
- The path nutrients take during decomposition
Correct answer: A sequence showing how energy moves from one organism to another
A food chain shows the linear transfer of energy through feeding relationships, starting with producers.
Question 5: Which gas do humans exhale?
- Oxygen
- Nitrogen
- Carbon dioxide (Correct answer)
- Hydrogen
Correct answer: Carbon dioxide
Humans exhale carbon dioxide as a waste product of cellular respiration.
Question 6: What tool is used to measure temperature?
- Barometer
- Anemometer
- Thermometer (Correct answer)
- Hygrometer
Correct answer: Thermometer
A thermometer measures temperature in degrees Fahrenheit or Celsius.
AASA Science and Technology 2
What is the role of decomposers in an ecosystem?