TerraNova Science 2 — Questions and Answers
Question 1: What is the basic unit of life?
- Cell (Correct answer)
- Atom
- Tissue
- Organ
Correct answer: Cell
The cell is the smallest structural and functional unit of all living organisms.
Question 2: Which gas do humans exhale in greater amounts compared to what they inhale?
- Carbon dioxide (Correct answer)
- Oxygen
- Nitrogen
- Hydrogen
Correct answer: Carbon dioxide
Humans exhale more carbon dioxide (COâ‚‚) because it is a waste product of cellular respiration.
Question 3: What force pulls objects toward Earth?
- Gravity (Correct answer)
- Magnetism
- Friction
- Tension
Correct answer: Gravity
Gravity is the force of attraction that pulls objects toward Earth's center.
Question 4: Which layer of the atmosphere contains the ozone layer?
- Stratosphere (Correct answer)
- Troposphere
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, about 15–35 km above Earth's surface.
Question 5: What is the term for an organism that makes its own food through photosynthesis?
- Producer (Correct answer)
- Consumer
- Decomposer
- Predator
Correct answer: Producer
Producers (autotrophs) make their own food using sunlight and form the base of food chains.
Question 6: What happens to water when it is heated to 100°C at sea level?
- It boils and turns to steam (Correct answer)
- It freezes into ice
- It becomes denser
- It turns into acid
Correct answer: It boils and turns to steam
Water boils at 100°C (212°F) at sea level, converting from liquid to water vapor (steam).
TerraNova Science 2
What is the basic unit of life?