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Factors Affecting Rate of Diffusion

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Questions and Answers

Which factor has the greatest effect on the rate of diffusion?

Surface area of the membrane
Temperature
Mass of the diffusing molecules
Concentration gradient (correct)

How does temperature affect the rate of diffusion?

Higher temperature decreases the rate of diffusion
Higher temperature increases the kinetic energy of particles, increasing the rate of diffusion (correct)
Temperature has no effect on the rate of diffusion
Higher temperature increases the mass of the diffusing molecules, decreasing the rate of diffusion

Which of the following states of matter has the fastest rate of diffusion?

Liquid
Solid
All states of matter have the same rate of diffusion
Gas (correct)

How does the mass of diffusing molecules affect the rate of diffusion?

Heavier molecules diffuse slower due to higher inertia (D) Signup and view all the answers

How does the distance a substance must travel affect the rate of diffusion?

The greater the distance, the slower the rate of diffusion (D) Signup and view all the answers

How does increasing the surface area of a membrane affect the rate of diffusion?

Increasing the surface area increases the rate of diffusion (C) Signup and view all the answers

What is the role of microvilli in absorption in the small intestine?

Increase surface area for diffusion (B) Signup and view all the answers

Why is diffusion considered a relatively slow process?

Continuous collisions among diffusing particles (C) Signup and view all the answers

What happens to diffusion when the concentration of a substance is equal in two areas?

It stops (A) Signup and view all the answers

Why do cells increase surface area for diffusion using microvilli?

To facilitate rapid absorption (B) Signup and view all the answers

What is the impact of temperature on the rate of diffusion?

Higher temperature increases diffusion rate (B) Signup and view all the answers

How do cells in the kidney or intestinal wall increase the rate of absorption through diffusion?

By forming microvilli to increase surface area (A) Signup and view all the answers

What is the main function of a cell membrane?

Regulation of substances entering and leaving the cell (D) Signup and view all the answers

Which type of transport moves substances from an area of high concentration to an area of low concentration without using cellular energy?

Passive transport (A) Signup and view all the answers

What drives diffusion in cells?

Random movements of particles due to kinetic energy (A) Signup and view all the answers

How does concentration gradient affect the rate of diffusion?

Higher concentration gradient leads to faster diffusion (B) Signup and view all the answers

What role does surface area play in the rate of diffusion?

Surface area directly affects the rate of diffusion (A) Signup and view all the answers

How does temperature affect the rate of diffusion in cells?

Higher temperature increases the rate of diffusion (D) Signup and view all the answers

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