Which graph represents the effect of increasing temperature on the rate of diffusion?
▶️ Answer/Explanation
Ans: D
Increasing temperature increases the kinetic energy of particles, leading to a higher rate of diffusion. The correct graph (D) shows a positive correlation between temperature and diffusion rate.
Graphs A and C show incorrect trends (decreasing or constant rate), while B depicts a sudden drop, which is unrealistic. Thus, D is the correct representation.
In which row will the diffusion of ions into a cell be the quickest?
▶️ Answer/Explanation
Ans: D
Diffusion is fastest when the concentration gradient is steepest (large difference between external and internal ion concentrations) and the temperature is highest (increases particle movement). Row D has the highest external ion concentration (30 mmol dm−3) and the highest temperature (40°C), making it the correct answer.
Rows A, B, and C have either lower concentrations or lower temperatures, slowing diffusion. Thus, D is the quickest.