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CIE iGCSE Co-Ordinated Science B3.1 Diffusion Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

What is a definition of diffusion?

A. the net movement of molecules from a region of their higher concentration to a region of their lower concentration down a concentration gradient
B. the net movement of molecules from a region of their higher concentration to a region of their lower concentration up a concentration gradient
C. the net movement of molecules from a region of their lower concentration to a region of their higher concentration down a concentration gradient
D. the net movement of molecules from a region of their lower concentration to a region of their higher concentration up a concentration gradient

▶️ Answer/Explanation
Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration, moving down the concentration gradient until equilibrium is reached. Option A correctly describes this definition, while option B incorrectly states “up a concentration gradient” and options C and D incorrectly describe movement from lower to higher concentration.
✅ Answer: (A)

Question

Which conditions will result in the fastest rate of diffusion?

 

▶️Answer/Explanation

Ans : A 

Question 

What is the effect of increasing the concentration gradient on the rate of diffusion?

▶️Answer/Explanation

Answer: C

Question

What is the net movement of molecules during diffusion?

A. from a higher concentration to a lower concentration down a concentration gradient

B. from a higher concentration to a lower concentration up a concentration gradient

C. from a lower concentration to a higher concentration down a concentration gradient

D. from a lower concentration to a higher concentration up a concentration gradient

▶️Answer/Explanation

Answer: A

Explanation: Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration, down the concentration gradient. This process occurs due to the random motion of particles and does not require energy input.

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