+20 Questions on Water and Life
20 multiple choice questions on Water and Life, ideal for middle school, high school, or introductory college biology courses. The correct answers are listed at the end.
Multiple Choice Questions: Water and Life
1. What type of molecule is water?
A) Ionic
B) Polar
C) Nonpolar
D) Metallic
2. Which element is found in water along with hydrogen?
A) Nitrogen
B) Carbon
C) Oxygen
D) Phosphorus
3. How many hydrogen atoms are in one molecule of water (H₂O)?
A) 1
B) 2
C) 3
D) 0
4. What property of water allows it to dissolve many substances?
A) High temperature
B) Low boiling point
C) Polarity
D) Neutral pH
5. Water’s ability to stick to other water molecules is called:
A) Adhesion
B) Cohesion
C) Tension
D) Capillarity
6. Water’s ability to stick to other substances is called:
A) Adhesion
B) Cohesion
C) Fusion
D) Friction
7. Which property allows water to move up thin tubes in plants?
A) Density
B) Viscosity
C) Capillary action
D) Osmosis
8. What causes surface tension in water?
A) Gravity
B) High salinity
C) Cohesion
D) Temperature
9. Which term describes water’s resistance to temperature change?
A) High heat capacity
B) Low boiling point
C) Low viscosity
D) High density
10. Why is water considered the “universal solvent”?
A) It is neutral
B) It can dissolve polar and ionic substances
C) It dissolves only gases
D) It dissolves all substances equally
11. What happens to water when it freezes?
A) It gets denser
B) It becomes a gas
C) It expands
D) It turns into salt
12. Which of the following is NOT a function of water in living organisms?
A) Temperature regulation
B) Providing energy
C) Solvent for reactions
D) Transport of nutrients
13. What is the pH of pure water?
A) 2
B) 5
C) 7
D) 10
14. What type of bond holds hydrogen and oxygen together within a water molecule?
A) Hydrogen bond
B) Ionic bond
C) Covalent bond
D) Metallic bond
15. What type of bond forms between different water molecules?
A) Covalent
B) Hydrogen
C) Ionic
D) Metallic
16. Which property of water helps stabilize Earth’s climate?
A) High viscosity
B) Transparency
C) High heat capacity
D) High density
17. How does water help with chemical reactions in the body?
A) It reacts with sunlight
B) It provides a medium for reactions
C) It removes oxygen
D) It stops reactions
18. What property of water is essential for maintaining homeostasis in organisms?
A) High melting point
B) High specific heat
C) Neutral odor
D) Low solubility
19. Water is essential to life because:
A) It is acidic
B) It repels all solutes
C) It supports all known forms of life
D) It is only found in oceans
20. Why does ice float on water?
A) It has more hydrogen bonds
B) It is less dense than liquid water
C) It contains no oxygen
D) It is heavier
Answer Key
1. B) Polar
2. C) Oxygen
3. B) 2
4. C) Polarity
5. B) Cohesion
6. A) Adhesion
7. C) Capillary action
8. C) Cohesion
9. A) High heat capacity
10. B) It can dissolve polar and ionic substances
11. C) It expands
12. B) Providing energy
13. C) 7
14. C) Covalent bond
15. B) Hydrogen
16. C) High heat capacity
17. B) It provides a medium for reactions
18. B) High specific heat
19. C) It supports all known forms of life
20. B) It is less dense than liquid water
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