MAP MAP Science 2 — Questions and Answers
Question 1: What is the key difference between a physical change and a chemical change?
- A physical change does not create a new substance; a chemical change does (Correct answer)
- A physical change is permanent; a chemical change is reversible
- A physical change involves heat; a chemical change does not
- A physical change is invisible; a chemical change is visible
Correct answer: A physical change does not create a new substance; a chemical change does
A physical change alters the form or appearance of matter without producing a new substance, while a chemical change creates a new substance with different properties.
Question 2: Which type of rock forms when magma or lava cools and solidifies?
- Igneous rock (Correct answer)
- Sedimentary rock
- Metamorphic rock
- Mineral
Correct answer: Igneous rock
Igneous rock forms when molten rock (magma underground or lava at the surface) cools and solidifies.
Question 3: What is DNA?
- A molecule that carries the genetic instructions for living organisms (Correct answer)
- A type of protein that speeds up chemical reactions
- A structure in the cell that produces energy
- A molecule that carries oxygen in the blood
Correct answer: A molecule that carries the genetic instructions for living organisms
DNA (deoxyribonucleic acid) is the molecule that carries genetic information and is found in the nucleus of cells.
Question 4: What is the primary function of the respiratory system?
- To exchange oxygen and carbon dioxide between the body and the environment (Correct answer)
- To pump blood throughout the body
- To break down food into nutrients
- To filter waste from the blood
Correct answer: To exchange oxygen and carbon dioxide between the body and the environment
The respiratory system, which includes the lungs, brings oxygen into the body and removes carbon dioxide.
Question 5: Which force is responsible for pulling objects toward Earth's surface?
- Gravity (Correct answer)
- Friction
- Magnetism
- Tension
Correct answer: Gravity
Gravity is the attractive force that pulls all objects with mass toward Earth's center.
Question 6: What is adaptation in biology?
- A trait that helps an organism survive and reproduce in its environment (Correct answer)
- The process of changing an environment to suit an organism
- A learned behavior taught to offspring
- The migration of animals to warmer climates
Correct answer: A trait that helps an organism survive and reproduce in its environment
An adaptation is an inherited trait that increases an organism's ability to survive and reproduce in its specific environment.
MAP MAP Science 2
What is the key difference between a physical change and a chemical change?