🔄 Diffusion & Concentration
Master the fundamental process of passive transport through diffusion! This quiz explores how particles move across membranes without energy, the role of concentration gradients, and the factors that influence diffusion rates in living cells. **What you'll learn:** - How particles move from high to low concentration naturally - Why concentration gradients drive passive transport - How temperature and particle size affect diffusion speed - Real-world biological examples of diffusion in action
Questions in this quiz
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- Question 1
What is the primary driving force that causes particles to move during diffusion?
- Question 2
Which factor would INCREASE the rate of diffusion of sugar molecules across a cell membrane?
- Question 3
During diffusion, particles move only in one direction: from high concentration to low concentration.
- Question 4
A red blood cell is placed in a solution with a lower concentration of dissolved solutes than the cell cytoplasm. What will happen?
- Question 5
Why do small molecules like oxygen and nitrogen diffuse across cell membranes more easily than large molecules like proteins?
- Question 6
Diffusion is a form of active transport because the cell must use energy to move particles across the membrane.
- Question 7
In which scenario would the rate of diffusion be SLOWEST?
- Question 8
When a concentration gradient no longer exists and particles are evenly distributed, the system has reached—
- Question 9
Which of the following is a real-world example of diffusion in a living organism?
- Question 10
A concentration gradient is the difference in the number of dissolved particles between two areas separated by a membrane.
- Question 11
If you place a piece of food coloring in a glass of hot water versus a glass of cold water, the color spreads faster in the hot water. This demonstrates—
- Question 12
A cell membrane is described as semipermeable. What does this mean in the context of diffusion?
- Question 13
Particles stop moving once they have diffused across a membrane and reached the other side.
- Question 14
How does an increase in the concentration difference (gradient) between two sides of a membrane affect the rate of diffusion?
- Question 15
Why is oxygen able to diffuse directly across the cell membrane without requiring a carrier protein or energy?
- Question 16
A plant cell is placed in a hypertonic solution (higher solute concentration outside than inside). What process occurs and what is the likely result?