How does the difference in concentration affect the rate of diffusion of oxygen across a membrane?

• A. A greater concentration difference increases the rate of diffusion.
• B. A smaller concentration difference increases the rate of diffusion.
• C. The concentration difference has no effect on the rate of diffusion.
• D. A greater concentration difference decreases the rate of diffusion.

Answer: (A)

Verified step by step guidance

1. Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
2. Identify the role of the concentration gradient: The concentration gradient is the difference in concentration between two regions. A steeper gradient (greater difference) typically results in faster diffusion because molecules move more rapidly to equalize the concentrations.
3. Relate the concentration difference to the rate of diffusion: A greater concentration difference means there is a stronger driving force for molecules to move across the membrane, increasing the rate of diffusion.
4. Consider the options provided: Evaluate each answer choice based on the principles of diffusion and the relationship between concentration gradient and diffusion rate.
5. Conclude based on scientific reasoning: The correct answer is the one that aligns with the principle that a greater concentration difference increases the rate of diffusion, as supported by the concept of the concentration gradient.