GIZMOS Student Exploration Diffusion
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1. What is diffusion?
A. Movement of water only
B. Movement of particles from low to high concentration
C. Movement of particles from high to low concentration
D. Movement requiring energy
explanation: Diffusion is the passive movement of particles down their
concentration gradient.
2. Which factor increases the rate of diffusion?
A. Lower temperature
B. Larger particle size
C. Higher temperature
D. Lower concentration gradient
explanation: Higher temperature increases kinetic energy, speeding up
particle movement.
3. In diffusion, equilibrium is reached when:
A. Particles stop moving
B. Concentration is equal throughout
C. Energy is used up
D. One side has more particles
, explanation: Particles continue moving, but concentrations become evenly
distributed.
4. Which best describes passive transport?
A. Requires ATP
B. Moves against gradient
C. Does not require energy
D. Uses pumps
explanation: Passive transport like diffusion requires no cellular energy.
5. A strong smell spreading across a room is an example of:
A. Osmosis
B. Active transport
C. Diffusion
D. Filtration
explanation: Gas particles spread from high concentration to low
concentration.
6. What happens to diffusion rate if surface area increases?
A. Decreases
B. Stops
C. Increases
D. Remains same
explanation: More surface area allows more particles to move at once.
7. Which particles diffuse fastest?
A. Large solids
B. Liquids
C. Gases
D. Macromolecules
explanation: Gas particles move freely and rapidly compared to others.
8. Which scenario shows diffusion?
A. Pumping ions across membrane
B. Perfume spreading in air
, C. Blood circulation
D. Muscle contraction
explanation: Perfume molecules move from high to low concentration.
9. What happens when concentration gradient is steep?
A. Slower diffusion
B. No diffusion
C. Faster diffusion
D. Reverse diffusion
explanation: Greater difference in concentration increases movement rate.
10.Diffusion stops when:
A. Energy ends
B. Equilibrium is reached
C. Temperature drops
D. Membrane forms
explanation: Net movement stops when concentrations equalize.
11.Which factor does NOT affect diffusion?
A. Temperature
B. Concentration gradient
C. Particle size
D. Color of particles
explanation: Color has no impact on particle movement.
12.Diffusion across a membrane is called:
A. Osmosis
B. Facilitated diffusion (if protein used)
C. Active transport
D. Filtration
explanation: Facilitated diffusion uses proteins but still passive.
13.Which direction do particles move in diffusion?
A. Random only
B. Low to high
Newest 2026-2027 Updated 100
Questions From Actual Exams Complete
Questions And Correct Detailed
Answers (Expert Verified Exam)
|Already Graded A+||Brand New!!
1. What is diffusion?
A. Movement of water only
B. Movement of particles from low to high concentration
C. Movement of particles from high to low concentration
D. Movement requiring energy
explanation: Diffusion is the passive movement of particles down their
concentration gradient.
2. Which factor increases the rate of diffusion?
A. Lower temperature
B. Larger particle size
C. Higher temperature
D. Lower concentration gradient
explanation: Higher temperature increases kinetic energy, speeding up
particle movement.
3. In diffusion, equilibrium is reached when:
A. Particles stop moving
B. Concentration is equal throughout
C. Energy is used up
D. One side has more particles
, explanation: Particles continue moving, but concentrations become evenly
distributed.
4. Which best describes passive transport?
A. Requires ATP
B. Moves against gradient
C. Does not require energy
D. Uses pumps
explanation: Passive transport like diffusion requires no cellular energy.
5. A strong smell spreading across a room is an example of:
A. Osmosis
B. Active transport
C. Diffusion
D. Filtration
explanation: Gas particles spread from high concentration to low
concentration.
6. What happens to diffusion rate if surface area increases?
A. Decreases
B. Stops
C. Increases
D. Remains same
explanation: More surface area allows more particles to move at once.
7. Which particles diffuse fastest?
A. Large solids
B. Liquids
C. Gases
D. Macromolecules
explanation: Gas particles move freely and rapidly compared to others.
8. Which scenario shows diffusion?
A. Pumping ions across membrane
B. Perfume spreading in air
, C. Blood circulation
D. Muscle contraction
explanation: Perfume molecules move from high to low concentration.
9. What happens when concentration gradient is steep?
A. Slower diffusion
B. No diffusion
C. Faster diffusion
D. Reverse diffusion
explanation: Greater difference in concentration increases movement rate.
10.Diffusion stops when:
A. Energy ends
B. Equilibrium is reached
C. Temperature drops
D. Membrane forms
explanation: Net movement stops when concentrations equalize.
11.Which factor does NOT affect diffusion?
A. Temperature
B. Concentration gradient
C. Particle size
D. Color of particles
explanation: Color has no impact on particle movement.
12.Diffusion across a membrane is called:
A. Osmosis
B. Facilitated diffusion (if protein used)
C. Active transport
D. Filtration
explanation: Facilitated diffusion uses proteins but still passive.
13.Which direction do particles move in diffusion?
A. Random only
B. Low to high
